638085808580836 has 96 divisors (see below), whose sum is σ = 1392906969683712. Its totient is φ = 248476366333440.

The previous prime is 638085808580783. The next prime is 638085808580839.

638085808580836 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×638085808580836² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638085808580839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4966473030 + ... + 4966601506.

It is an arithmetic number, because the mean of its divisors is an integer number (14509447600872).

Almost surely, 2^{638085808580836} is an apocalyptic number.

It is an amenable number.

638085808580836 is an abundant number, since it is smaller than the sum of its proper divisors (754821161102876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638085808580836 is a wasteful number, since it uses less digits than its factorization.

638085808580836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136709 (or 136707 counting only the distinct ones).

The product of its (nonzero) digits is 2123366400, while the sum is 76.

The spelling of 638085808580836 in words is "six hundred thirty-eight trillion, eighty-five billion, eight hundred eight million, five hundred eighty thousand, eight hundred thirty-six".