18385638402 has 16 divisors (see below), whose sum is σ = 37765095552. Its totient is φ = 5962909680.

The previous prime is 18385638353. The next prime is 18385638493. The reversal of 18385638402 is 20483658381.

It is a super-2 number, since 2×18385638402² (a number of 21 digits) contains 22 as substring.

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, 41408874 + ... + 41409317.

It is an arithmetic number, because the mean of its divisors is an integer number (2360318472).

Almost surely, 2^18385638402 is an apocalyptic number.

18385638402 is an abundant number, since it is smaller than the sum of its proper divisors (19379457150).

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

18385638402 is a wasteful number, since it uses less digits than its factorization.

18385638402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82818233.

The product of its (nonzero) digits is 1105920, while the sum is 48.

The spelling of 18385638402 in words is "eighteen billion, three hundred eighty-five million, six hundred thirty-eight thousand, four hundred two".