18919497897732 has 96 divisors (see below), whose sum is σ = 44860706795520. Its totient is φ = 6204964193280.

The previous prime is 18919497897721. The next prime is 18919497897733. The reversal of 18919497897732 is 23779879491981.

It is not an unprimeable number, because it can be changed into a prime (18919497897733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1076859444 + ... + 1076877012.

It is an arithmetic number, because the mean of its divisors is an integer number (467299029120).

Almost surely, 2^{18919497897732} is an apocalyptic number.

18919497897732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18919497897732 is an abundant number, since it is smaller than the sum of its proper divisors (25941208897788).

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

18919497897732 is a wasteful number, since it uses less digits than its factorization.

18919497897732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22033 (or 22031 counting only the distinct ones).

The product of its digits is 3456649728, while the sum is 84.

The spelling of 18919497897732 in words is "eighteen trillion, nine hundred nineteen billion, four hundred ninety-seven million, eight hundred ninety-seven thousand, seven hundred thirty-two".