31939874666 has 16 divisors (see below), whose sum is σ = 55059963840. Its totient is φ = 13612044480.

The previous prime is 31939874663. The next prime is 31939874689. The reversal of 31939874666 is 66647893913.

It is a super-2 number, since 2×31939874666² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31939874599 and 31939874608.

It is not an unprimeable number, because it can be changed into a prime (31939874663) 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 7 ways as a sum of consecutive naturals, for example, 6370175 + ... + 6375186.

It is an arithmetic number, because the mean of its divisors is an integer number (3441247740).

Almost surely, 2^31939874666 is an apocalyptic number.

31939874666 is a deficient number, since it is larger than the sum of its proper divisors (23120089174).

31939874666 is a wasteful number, since it uses less digits than its factorization.

31939874666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12745549.

The product of its digits is 35271936, while the sum is 62.

The spelling of 31939874666 in words is "thirty-one billion, nine hundred thirty-nine million, eight hundred seventy-four thousand, six hundred sixty-six".