31680207537 has 12 divisors (see below), whose sum is σ = 46429395600. Its totient is φ = 19200125560.

The previous prime is 31680207499. The next prime is 31680207539. The reversal of 31680207537 is 73570208613.

It is not a de Polignac number, because 31680207537 - 2³⁰ = 30606465713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31680207539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43636287 + ... + 43637012.

It is an arithmetic number, because the mean of its divisors is an integer number (3869116300).

Almost surely, 2^31680207537 is an apocalyptic number.

It is an amenable number.

31680207537 is a deficient number, since it is larger than the sum of its proper divisors (14749188063).

31680207537 is a wasteful number, since it uses less digits than its factorization.

31680207537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87273324 (or 87273313 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 31680207537 in words is "thirty-one billion, six hundred eighty million, two hundred seven thousand, five hundred thirty-seven".