18997623532 has 24 divisors (see below), whose sum is σ = 34038857664. Its totient is φ = 9273255552.

The previous prime is 18997623529. The next prime is 18997623563. The reversal of 18997623532 is 23532679981.

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, 52633 + ... + 201904.

It is an arithmetic number, because the mean of its divisors is an integer number (1418285736).

Almost surely, 2^18997623532 is an apocalyptic number.

It is an amenable number.

18997623532 is a deficient number, since it is larger than the sum of its proper divisors (15041234132).

18997623532 is a wasteful number, since it uses less digits than its factorization.

18997623532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254985 (or 254983 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 55.

The spelling of 18997623532 in words is "eighteen billion, nine hundred ninety-seven million, six hundred twenty-three thousand, five hundred thirty-two".