18909918736 has 40 divisors (see below), whose sum is σ = 37520857440. Its totient is φ = 9227479296.

The previous prime is 18909918697. The next prime is 18909918751. The reversal of 18909918736 is 63781990981.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 876171 + ... + 897493.

It is an arithmetic number, because the mean of its divisors is an integer number (938021436).

Almost surely, 2^18909918736 is an apocalyptic number.

18909918736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18909918736 is a deficient number, since it is larger than the sum of its proper divisors (18610938704).

18909918736 is a wasteful number, since it uses less digits than its factorization.

18909918736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22663 (or 22657 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 61.

The spelling of 18909918736 in words is "eighteen billion, nine hundred nine million, nine hundred eighteen thousand, seven hundred thirty-six".