18331883721516 has 12 divisors (see below), whose sum is σ = 42774395350232. Its totient is φ = 6110627907168.

The previous prime is 18331883721491. The next prime is 18331883721551. The reversal of 18331883721516 is 61512738813381.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763828488385 + ... + 763828488408.

Almost surely, 2^{18331883721516} is an apocalyptic number.

It is an amenable number.

18331883721516 is an abundant number, since it is smaller than the sum of its proper divisors (24442511628716).

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

18331883721516 is a wasteful number, since it uses less digits than its factorization.

18331883721516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527656976800 (or 1527656976798 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 57.

The spelling of 18331883721516 in words is "eighteen trillion, three hundred thirty-one billion, eight hundred eighty-three million, seven hundred twenty-one thousand, five hundred sixteen".