31373696816 has 160 divisors (see below), whose sum is σ = 78714961920. Its totient is φ = 11755987200.

The previous prime is 31373696803. The next prime is 31373696881. The reversal of 31373696816 is 61869637313.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6375605 + ... + 6380523.

It is an arithmetic number, because the mean of its divisors is an integer number (491968512).

Almost surely, 2^31373696816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31373696816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39357480960).

31373696816 is an abundant number, since it is smaller than the sum of its proper divisors (47341265104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31373696816 is a wasteful number, since it uses less digits than its factorization.

31373696816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143 (or 5137 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 53.

The spelling of 31373696816 in words is "thirty-one billion, three hundred seventy-three million, six hundred ninety-six thousand, eight hundred sixteen".