231556393854 has 24 divisors (see below), whose sum is σ = 523518804432. Its totient is φ = 73829574720.

The previous prime is 231556393807. The next prime is 231556393879. The reversal of 231556393854 is 458393655132.

231556393854 is a `hidden beast` number, since 2 + 3 + 1 + 556 + 3 + 9 + 3 + 85 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 231556393854.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279657067 + ... + 279657894.

It is an arithmetic number, because the mean of its divisors is an integer number (21813283518).

Almost surely, 2^231556393854 is an apocalyptic number.

231556393854 is an abundant number, since it is smaller than the sum of its proper divisors (291962410578).

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

231556393854 is a wasteful number, since it uses less digits than its factorization.

231556393854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559314992 (or 559314989 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 54.

The spelling of 231556393854 in words is "two hundred thirty-one billion, five hundred fifty-six million, three hundred ninety-three thousand, eight hundred fifty-four".