31971662438866 has 16 divisors (see below), whose sum is σ = 49072992845184. Its totient is φ = 15614001318384.

The previous prime is 31971662438789. The next prime is 31971662438869. The reversal of 31971662438866 is 66883426617913.

It is a junction number, because it is equal to n+sod(n) for n = 31971662438795 and 31971662438804.

It is not an unprimeable number, because it can be changed into a prime (31971662438869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24078720 + ... + 25371796.

It is an arithmetic number, because the mean of its divisors is an integer number (3067062052824).

Almost surely, 2^{31971662438866} is an apocalyptic number.

31971662438866 is a deficient number, since it is larger than the sum of its proper divisors (17101330406318).

31971662438866 is a wasteful number, since it uses less digits than its factorization.

31971662438866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580625.

The product of its digits is 376233984, while the sum is 70.

The spelling of 31971662438866 in words is "thirty-one trillion, nine hundred seventy-one billion, six hundred sixty-two million, four hundred thirty-eight thousand, eight hundred sixty-six".