18557172402 has 16 divisors (see below), whose sum is σ = 37176939360. Its totient is φ = 6175291712.

The previous prime is 18557172379. The next prime is 18557172419. The reversal of 18557172402 is 20427175581.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2604252 + ... + 2611367.

It is an arithmetic number, because the mean of its divisors is an integer number (2323558710).

Almost surely, 2^18557172402 is an apocalyptic number.

18557172402 is an abundant number, since it is smaller than the sum of its proper divisors (18619766958).

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

18557172402 is a wasteful number, since it uses less digits than its factorization.

18557172402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5216217.

The product of its (nonzero) digits is 156800, while the sum is 42.

The spelling of 18557172402 in words is "eighteen billion, five hundred fifty-seven million, one hundred seventy-two thousand, four hundred two".