31563550161 has 72 divisors (see below), whose sum is σ = 54271575072. Its totient is φ = 17521920000.

The previous prime is 31563550133. The next prime is 31563550163. The reversal of 31563550161 is 16105536513.

31563550161 is a `hidden beast` number, since 3 + 1 + 5 + 635 + 5 + 0 + 16 + 1 = 666.

It is not a de Polignac number, because 31563550161 - 2⁵ = 31563550129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31563550163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2184561 + ... + 2198961.

It is an arithmetic number, because the mean of its divisors is an integer number (753771876).

Almost surely, 2^31563550161 is an apocalyptic number.

It is an amenable number.

31563550161 is a deficient number, since it is larger than the sum of its proper divisors (22708024911).

31563550161 is a wasteful number, since it uses less digits than its factorization.

31563550161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14575 (or 14559 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The spelling of 31563550161 in words is "thirty-one billion, five hundred sixty-three million, five hundred fifty thousand, one hundred sixty-one".