18638910425 has 24 divisors (see below), whose sum is σ = 24159882240. Its totient is φ = 14247417600.

The previous prime is 18638910413. The next prime is 18638910439. The reversal of 18638910425 is 52401983681.

It is a happy number.

It is not a de Polignac number, because 18638910425 - 2²⁰ = 18637861849 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18638910425.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90992 + ... + 213441.

It is an arithmetic number, because the mean of its divisors is an integer number (1006661760).

Almost surely, 2^18638910425 is an apocalyptic number.

It is an amenable number.

18638910425 is a deficient number, since it is larger than the sum of its proper divisors (5520971815).

18638910425 is a wasteful number, since it uses less digits than its factorization.

18638910425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304553 (or 304548 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 18638910425 in words is "eighteen billion, six hundred thirty-eight million, nine hundred ten thousand, four hundred twenty-five".