31056503661 has 24 divisors (see below), whose sum is σ = 45512266176. Its totient is φ = 20403489600.

The previous prime is 31056503629. The next prime is 31056503683. The reversal of 31056503661 is 16630565013.

31056503661 is a `hidden beast` number, since 3 + 1 + 0 + 565 + 0 + 36 + 61 = 666.

It is not a de Polignac number, because 31056503661 - 2⁵ = 31056503629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31056503461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 784186 + ... + 822836.

It is an arithmetic number, because the mean of its divisors is an integer number (1896344424).

Almost surely, 2^31056503661 is an apocalyptic number.

It is an amenable number.

31056503661 is a deficient number, since it is larger than the sum of its proper divisors (14455762515).

31056503661 is a wasteful number, since it uses less digits than its factorization.

31056503661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39953 (or 39950 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The spelling of 31056503661 in words is "thirty-one billion, fifty-six million, five hundred three thousand, six hundred sixty-one".