18366432225 has 12 divisors (see below), whose sum is σ = 30365834736. Its totient is φ = 9795430480.

The previous prime is 18366432197. The next prime is 18366432241. The reversal of 18366432225 is 52223466381.

It is a happy number.

It is not a de Polignac number, because 18366432225 - 2²⁸ = 18097996769 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122442807 + ... + 122442956.

It is an arithmetic number, because the mean of its divisors is an integer number (2530486228).

Almost surely, 2^18366432225 is an apocalyptic number.

18366432225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18366432225 is a deficient number, since it is larger than the sum of its proper divisors (11999402511).

18366432225 is a wasteful number, since it uses less digits than its factorization.

18366432225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244885776 (or 244885771 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The spelling of 18366432225 in words is "eighteen billion, three hundred sixty-six million, four hundred thirty-two thousand, two hundred twenty-five".