18521425323 has 12 divisors (see below), whose sum is σ = 27616175808. Its totient is φ = 11949306480.

The previous prime is 18521425309. The next prime is 18521425343. The reversal of 18521425323 is 32352412581.

18521425323 is a `hidden beast` number, since 1 + 85 + 2 + 1 + 42 + 532 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-18521425323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18521425343) 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, 33192240 + ... + 33192797.

It is an arithmetic number, because the mean of its divisors is an integer number (2301347984).

Almost surely, 2^18521425323 is an apocalyptic number.

18521425323 is a deficient number, since it is larger than the sum of its proper divisors (9094750485).

18521425323 is a wasteful number, since it uses less digits than its factorization.

18521425323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66385074 (or 66385071 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The spelling of 18521425323 in words is "eighteen billion, five hundred twenty-one million, four hundred twenty-five thousand, three hundred twenty-three".