18909332154 has 24 divisors (see below), whose sum is σ = 41207048532. Its totient is φ = 6266675520.

The previous prime is 18909332153. The next prime is 18909332159. The reversal of 18909332154 is 45123390981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14490140625 + 4419191529 = 120375^2 + 66477^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18909332153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3033067 + ... + 3039294.

Almost surely, 2^18909332154 is an apocalyptic number.

18909332154 is an abundant number, since it is smaller than the sum of its proper divisors (22297716378).

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

18909332154 is a wasteful number, since it uses less digits than its factorization.

18909332154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6072542 (or 6072539 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 18909332154 in words is "eighteen billion, nine hundred nine million, three hundred thirty-two thousand, one hundred fifty-four".