231666687843 has 16 divisors (see below), whose sum is σ = 310927315200. Its totient is φ = 153425709216.

The previous prime is 231666687839. The next prime is 231666687911. The reversal of 231666687843 is 348786666132.

It is not a de Polignac number, because 231666687843 - 2² = 231666687839 is a prime.

It is a super-2 number, since 2×231666687843² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231666687443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2097208 + ... + 2204906.

It is an arithmetic number, because the mean of its divisors is an integer number (19432957200).

Almost surely, 2^231666687843 is an apocalyptic number.

231666687843 is a deficient number, since it is larger than the sum of its proper divisors (79260627357).

231666687843 is a wasteful number, since it uses less digits than its factorization.

231666687843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112426.

The product of its digits is 41803776, while the sum is 60.

The spelling of 231666687843 in words is "two hundred thirty-one billion, six hundred sixty-six million, six hundred eighty-seven thousand, eight hundred forty-three".