18185856404 has 12 divisors (see below), whose sum is σ = 31842199200. Its totient is φ = 9088085208.

The previous prime is 18185856401. The next prime is 18185856457. The reversal of 18185856404 is 40465858181.

It is a super-2 number, since 2×18185856404² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18185856401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202294 + ... + 1217325.

It is an arithmetic number, because the mean of its divisors is an integer number (2653516600).

Almost surely, 2^18185856404 is an apocalyptic number.

It is an amenable number.

18185856404 is a deficient number, since it is larger than the sum of its proper divisors (13656342796).

18185856404 is a wasteful number, since it uses less digits than its factorization.

18185856404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421502 (or 2421500 counting only the distinct ones).

The product of its (nonzero) digits is 1228800, while the sum is 50.

The spelling of 18185856404 in words is "eighteen billion, one hundred eighty-five million, eight hundred fifty-six thousand, four hundred four".