231188981660 has 288 divisors, whose sum is σ = 638707829760. Its totient is φ = 68629856256.

The previous prime is 231188981659. The next prime is 231188981687. The reversal of 231188981660 is 66189881132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 46300124 + ... + 46305116.

It is an arithmetic number, because the mean of its divisors is an integer number (2217735520).

Almost surely, 2^231188981660 is an apocalyptic number.

231188981660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231188981660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319353914880).

231188981660 is an abundant number, since it is smaller than the sum of its proper divisors (407518848100).

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

231188981660 is a wasteful number, since it uses less digits than its factorization.

231188981660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5157 (or 5142 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 53.

The spelling of 231188981660 in words is "two hundred thirty-one billion, one hundred eighty-eight million, nine hundred eighty-one thousand, six hundred sixty".