18897176089 has 9 divisors (see below), whose sum is σ = 20772938431. Its totient is φ = 17177876320.

The previous prime is 18897176057. The next prime is 18897176099. The reversal of 18897176089 is 98067179881.

It is a happy number.

The square root of 18897176089 is 137467.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10097235225 + 8799940864 = 100485^2 + 93808^2 .

It is not a de Polignac number, because 18897176089 - 2⁵ = 18897176057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18897176089.

It is not an unprimeable number, because it can be changed into a prime (18897176029) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1505889 + ... + 1518385.

Almost surely, 2^18897176089 is an apocalyptic number.

18897176089 is the 137467-th square number.

18897176089 is the 68734-th centered octagonal number.

It is an amenable number.

18897176089 is a deficient number, since it is larger than the sum of its proper divisors (1875762342).

18897176089 is an frugal number, since it uses more digits than its factorization.

18897176089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25016 (or 12508 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 64.

Multiplying 18897176089 by its sum of digits (64), we get a square (1209419269696 = 1099736²).

The spelling of 18897176089 in words is "eighteen billion, eight hundred ninety-seven million, one hundred seventy-six thousand, eighty-nine".