18716816867456 has 32 divisors (see below), whose sum is σ = 37287680102400. Its totient is φ = 9358340292864.

The previous prime is 18716816867429. The next prime is 18716816867467. The reversal of 18716816867456 is 65476861861781.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

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, 20282465 + ... + 21185183.

It is an arithmetic number, because the mean of its divisors is an integer number (1165240003200).

Almost surely, 2^{18716816867456} is an apocalyptic number.

18716816867456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18716816867456 is a deficient number, since it is larger than the sum of its proper divisors (18570863234944).

18716816867456 is an equidigital number, since it uses as much as digits as its factorization.

18716816867456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064716 (or 1064704 counting only the distinct ones).

The product of its digits is 650280960, while the sum is 74.

The spelling of 18716816867456 in words is "eighteen trillion, seven hundred sixteen billion, eight hundred sixteen million, eight hundred sixty-seven thousand, four hundred fifty-six".