638910161216 has 56 divisors (see below), whose sum is σ = 1278989994720. Its totient is φ = 316657285632.

The previous prime is 638910161213. The next prime is 638910161233. The reversal of 638910161216 is 612161019836.

It is a super-2 number, since 2×638910161216² (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 (638910161213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3230891 + ... + 3422933.

Almost surely, 2^638910161216 is an apocalyptic number.

It is an amenable number.

638910161216 is an abundant number, since it is smaller than the sum of its proper divisors (640079833504).

638910161216 is a wasteful number, since it uses less digits than its factorization.

638910161216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192511 (or 192501 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 638910161216 in words is "six hundred thirty-eight billion, nine hundred ten million, one hundred sixty-one thousand, two hundred sixteen".