31978853209163 has 32 divisors (see below), whose sum is σ = 37757424291840. Its totient is φ = 26504293870080.

The previous prime is 31978853209157. The next prime is 31978853209181. The reversal of 31978853209163 is 36190235887913.

It is a cyclic number.

It is not a de Polignac number, because 31978853209163 - 2²⁶ = 31978786100299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31978853209163.

It is not an unprimeable number, because it can be changed into a prime (31978853200163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3252192095 + ... + 3252201927.

It is an arithmetic number, because the mean of its divisors is an integer number (1179919509120).

Almost surely, 2^{31978853209163} is an apocalyptic number.

31978853209163 is a deficient number, since it is larger than the sum of its proper divisors (5778571082677).

31978853209163 is a wasteful number, since it uses less digits than its factorization.

31978853209163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20747.

The product of its (nonzero) digits is 58786560, while the sum is 65.

The spelling of 31978853209163 in words is "thirty-one trillion, nine hundred seventy-eight billion, eight hundred fifty-three million, two hundred nine thousand, one hundred sixty-three".