231872288661 has 32 divisors (see below), whose sum is σ = 370018561920. Its totient is φ = 142659833472.

The previous prime is 231872288653. The next prime is 231872288671. The reversal of 231872288661 is 166882278132.

231872288661 is a `hidden beast` number, since 231 + 8 + 72 + 288 + 6 + 61 = 666.

It is not a de Polignac number, because 231872288661 - 2³ = 231872288653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231872288598 and 231872288607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231872288671) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1613430 + ... + 1751256.

It is an arithmetic number, because the mean of its divisors is an integer number (11563080060).

Almost surely, 2^231872288661 is an apocalyptic number.

It is an amenable number.

231872288661 is a deficient number, since it is larger than the sum of its proper divisors (138146273259).

231872288661 is a wasteful number, since it uses less digits than its factorization.

231872288661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142642 (or 142636 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 231872288661 in words is "two hundred thirty-one billion, eight hundred seventy-two million, two hundred eighty-eight thousand, six hundred sixty-one".