18516668525 has 6 divisors (see below), whose sum is σ = 22960669002. Its totient is φ = 14813334800.

The previous prime is 18516668483. The next prime is 18516668561. The reversal of 18516668525 is 52586661581.

It can be written as a sum of positive squares in 3 ways, for example, as 277355716 + 18239312809 = 16654^2 + 135053^2 .

It is not a de Polignac number, because 18516668525 - 2²⁰ = 18515619949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 370333346 + ... + 370333395.

It is an arithmetic number, because the mean of its divisors is an integer number (3826778167).

Almost surely, 2^18516668525 is an apocalyptic number.

It is an amenable number.

18516668525 is a deficient number, since it is larger than the sum of its proper divisors (4444000477).

18516668525 is an equidigital number, since it uses as much as digits as its factorization.

18516668525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740666751 (or 740666746 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 53.

The spelling of 18516668525 in words is "eighteen billion, five hundred sixteen million, six hundred sixty-eight thousand, five hundred twenty-five".