31643695616 has 160 divisors (see below), whose sum is σ = 72904708800. Its totient is φ = 13598392320.

The previous prime is 31643695607. The next prime is 31643695621. The reversal of 31643695616 is 61659634613.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7459256 + ... + 7463496.

It is an arithmetic number, because the mean of its divisors is an integer number (455654430).

Almost surely, 2^31643695616 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 31643695616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36452354400).

31643695616 is an abundant number, since it is smaller than the sum of its proper divisors (41261013184).

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

31643695616 is a wasteful number, since it uses less digits than its factorization.

31643695616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4350 (or 4334 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 50.

The spelling of 31643695616 in words is "thirty-one billion, six hundred forty-three million, six hundred ninety-five thousand, six hundred sixteen".