638645546836 has 96 divisors (see below), whose sum is σ = 1305897272064. Its totient is φ = 270063360000.

The previous prime is 638645546831. The next prime is 638645546881.

638645546836 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×638645546836² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638645546831) 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, 47664090 + ... + 47677486.

It is an arithmetic number, because the mean of its divisors is an integer number (13603096584).

Almost surely, 2^638645546836 is an apocalyptic number.

It is an amenable number.

638645546836 is an abundant number, since it is smaller than the sum of its proper divisors (667251725228).

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

638645546836 is a wasteful number, since it uses less digits than its factorization.

638645546836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14161 (or 14159 counting only the distinct ones).

The product of its digits is 298598400, while the sum is 64.

The spelling of 638645546836 in words is "six hundred thirty-eight billion, six hundred forty-five million, five hundred forty-six thousand, eight hundred thirty-six".