138634562820432 has 80 divisors (see below), whose sum is σ = 409328703385472. Its totient is φ = 39607295016960.

The previous prime is 138634562820361. The next prime is 138634562820433. The reversal of 138634562820432 is 234028265436831.

It is a super-2 number, since 2×138634562820432² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138634562820433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8268913 + ... + 18591504.

Almost surely, 2^{138634562820432} is an apocalyptic number.

138634562820432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138634562820432 is an abundant number, since it is smaller than the sum of its proper divisors (270694140565040).

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

138634562820432 is a wasteful number, since it uses less digits than its factorization.

138634562820432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26875796 (or 26875790 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 57.

The spelling of 138634562820432 in words is "one hundred thirty-eight trillion, six hundred thirty-four billion, five hundred sixty-two million, eight hundred twenty thousand, four hundred thirty-two".