18331956416 has 28 divisors (see below), whose sum is σ = 36560302800. Its totient is φ = 9119911680.

The previous prime is 18331956413. The next prime is 18331956421. The reversal of 18331956416 is 61465913381.

It is not an unprimeable number, because it can be changed into a prime (18331956413) 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, 706955 + ... + 732426.

It is an arithmetic number, because the mean of its divisors is an integer number (1305725100).

Almost surely, 2^18331956416 is an apocalyptic number.

18331956416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18331956416 is a deficient number, since it is larger than the sum of its proper divisors (18228346384).

18331956416 is a wasteful number, since it uses less digits than its factorization.

18331956416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439592 (or 1439582 counting only the distinct ones).

The product of its digits is 466560, while the sum is 47.

The spelling of 18331956416 in words is "eighteen billion, three hundred thirty-one million, nine hundred fifty-six thousand, four hundred sixteen".