31616502816 has 96 divisors (see below), whose sum is σ = 88262516160. Its totient is φ = 9881174016.

The previous prime is 31616502793. The next prime is 31616502839. The reversal of 31616502816 is 61820561613.

It is an interprime number because it is at equal distance from previous prime (31616502793) and next prime (31616502839).

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87580 + ... + 266276.

It is an arithmetic number, because the mean of its divisors is an integer number (919401210).

Almost surely, 2^31616502816 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 31616502816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44131258080).

31616502816 is an abundant number, since it is smaller than the sum of its proper divisors (56646013344).

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

31616502816 is a wasteful number, since it uses less digits than its factorization.

31616502816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178826 (or 178818 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 31616502816 in words is "thirty-one billion, six hundred sixteen million, five hundred two thousand, eight hundred sixteen".