31916688018 has 8 divisors (see below), whose sum is σ = 63833376048. Its totient is φ = 10638896004.

The previous prime is 31916687983. The next prime is 31916688019. The reversal of 31916688018 is 81088661913.

It is a sphenic number, since it is the product of 3 distinct primes.

31916688018 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (31916688019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2659723996 + ... + 2659724007.

It is an arithmetic number, because the mean of its divisors is an integer number (7979172006).

Almost surely, 2^31916688018 is an apocalyptic number.

31916688018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31916688018 is a wasteful number, since it uses less digits than its factorization.

31916688018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5319448008.

The product of its (nonzero) digits is 497664, while the sum is 51.

The spelling of 31916688018 in words is "thirty-one billion, nine hundred sixteen million, six hundred eighty-eight thousand, eighteen".