231568417638 has 12 divisors (see below), whose sum is σ = 501731571588. Its totient is φ = 77189472540.

The previous prime is 231568417627. The next prime is 231568417687. The reversal of 231568417638 is 836714865132.

231568417638 is a `hidden beast` number, since 2 + 3 + 1 + 568 + 4 + 1 + 76 + 3 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6432456028 + ... + 6432456063.

It is an arithmetic number, because the mean of its divisors is an integer number (41810964299).

Almost surely, 2^231568417638 is an apocalyptic number.

231568417638 is an abundant number, since it is smaller than the sum of its proper divisors (270163153950).

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

231568417638 is a wasteful number, since it uses less digits than its factorization.

231568417638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12864912099 (or 12864912096 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 231568417638 in words is "two hundred thirty-one billion, five hundred sixty-eight million, four hundred seventeen thousand, six hundred thirty-eight".