31990570065 has 48 divisors (see below), whose sum is σ = 56956431168. Its totient is φ = 16604362368.

The previous prime is 31990570043. The next prime is 31990570099. The reversal of 31990570065 is 56007509913.

31990570065 is a `hidden beast` number, since 3 + 19 + 9 + 0 + 570 + 0 + 65 = 666.

It is not a de Polignac number, because 31990570065 - 2⁷ = 31990569937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 31990570065.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 186327 + ... + 314163.

It is an arithmetic number, because the mean of its divisors is an integer number (1186592316).

Almost surely, 2^31990570065 is an apocalyptic number.

It is an amenable number.

31990570065 is a deficient number, since it is larger than the sum of its proper divisors (24965861103).

31990570065 is a wasteful number, since it uses less digits than its factorization.

31990570065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127998 (or 127995 counting only the distinct ones).

The product of its (nonzero) digits is 255150, while the sum is 45.

The spelling of 31990570065 in words is "thirty-one billion, nine hundred ninety million, five hundred seventy thousand, sixty-five".