18897196944 has 20 divisors (see below), whose sum is σ = 48817758896. Its totient is φ = 6299065632.

The previous prime is 18897196939. The next prime is 18897196973. The reversal of 18897196944 is 44969179881.

It is a happy number.

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, 196845754 + ... + 196845849.

Almost surely, 2^18897196944 is an apocalyptic number.

It is an amenable number.

18897196944 is an abundant number, since it is smaller than the sum of its proper divisors (29920561952).

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

18897196944 is a wasteful number, since it uses less digits than its factorization.

18897196944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393691614 (or 393691608 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 66.

The spelling of 18897196944 in words is "eighteen billion, eight hundred ninety-seven million, one hundred ninety-six thousand, nine hundred forty-four".