231518672355220 has 48 divisors (see below), whose sum is σ = 514855937389248. Its totient is φ = 87148565895680.

The previous prime is 231518672355211. The next prime is 231518672355247. The reversal of 231518672355220 is 22553276815132.

It is a super-2 number, since 2×231518672355220² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41947846 + ... + 47145085.

It is an arithmetic number, because the mean of its divisors is an integer number (10726165362276).

Almost surely, 2^{231518672355220} is an apocalyptic number.

231518672355220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231518672355220 is an abundant number, since it is smaller than the sum of its proper divisors (283337265034028).

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

231518672355220 is a wasteful number, since it uses less digits than its factorization.

231518672355220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89100600 (or 89100598 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 52.

The spelling of 231518672355220 in words is "two hundred thirty-one trillion, five hundred eighteen billion, six hundred seventy-two million, three hundred fifty-five thousand, two hundred twenty".