EnumCache Class with MaxValue\MinValue underlying number

enumCache.cs

public static class EnumCache<T>
{
    public class Cache<X>
    {
        public Array Values { get; }
        public object[] UnderlyingValues { get; }
        public int TotalValues { get; }
        public Type UnderlyingType { get; }
        public Type SelfType => typeof(X);

        public long MaxValue => 
            this.UnderlyingValues.Select(x => (long)Convert.ChangeType(x, typeof(long))).Max(x => x);
        public long MinValue => 
            this.UnderlyingValues.Select(x => (long)Convert.ChangeType(x, typeof(long))).Min(x => x);

        public ulong UnsignedMaxValue =>
            this.UnderlyingValues.Select(x => (ulong)Convert.ChangeType(x, typeof(ulong))).Max(x => x);
        public ulong UnsignedMinValue =>
            this.UnderlyingValues.Select(x => (ulong)Convert.ChangeType(x, typeof(ulong))).Min(x => x);

        public Cache()
        {
            this.Values = Enum.GetValues(typeof(X));
            this.TotalValues = Enum.GetValues(typeof(X)).Length;
            this.UnderlyingType = Enum.GetUnderlyingType(typeof(X));

            this.UnderlyingValues = Enumerable.Range(0, this.TotalValues).Select(x => this.Values.GetValue(x))
                .Select(x => Convert.ChangeType(x, this.UnderlyingType)).ToArray();
        }
    }

    private static Cache<T> _cache;
    public static Cache<T> Value => _cache ??= new Cache<T>();
}