18656796720 has 80 divisors (see below), whose sum is σ = 57851297280. Its totient is φ = 4973836032.

The previous prime is 18656796703. The next prime is 18656796721. The reversal of 18656796720 is 2769765681.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (18656796721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1201647 + ... + 1217073.

It is an arithmetic number, because the mean of its divisors is an integer number (723141216).

Almost surely, 2^18656796720 is an apocalyptic number.

18656796720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18656796720 is an abundant number, since it is smaller than the sum of its proper divisors (39194500560).

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

18656796720 is a wasteful number, since it uses less digits than its factorization.

18656796720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20482 (or 20476 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 57.

The spelling of 18656796720 in words is "eighteen billion, six hundred fifty-six million, seven hundred ninety-six thousand, seven hundred twenty".