638101804890052 has 6 divisors (see below), whose sum is σ = 1116678158557598. Its totient is φ = 319050902445024.

The previous prime is 638101804890047. The next prime is 638101804890103. The reversal of 638101804890052 is 250098408101836.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 594315845416836 + 43785959473216 = 24378594^2 + 6617096^2 .

It is a junction number, because it is equal to n+sod(n) for n = 638101804889975 and 638101804890002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79762725611253 + ... + 79762725611260.

Almost surely, 2^{638101804890052} is an apocalyptic number.

It is an amenable number.

638101804890052 is a deficient number, since it is larger than the sum of its proper divisors (478576353667546).

638101804890052 is a wasteful number, since it uses less digits than its factorization.

638101804890052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159525451222517 (or 159525451222515 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 638101804890052 in words is "six hundred thirty-eight trillion, one hundred one billion, eight hundred four million, eight hundred ninety thousand, fifty-two".