18180418446 has 24 divisors (see below), whose sum is σ = 39547852344. Its totient is φ = 6035994000.

The previous prime is 18180418433. The next prime is 18180418483. The reversal of 18180418446 is 64481408181.

18180418446 is a `hidden beast` number, since 18 + 180 + 4 + 18 + 446 = 666.

It is a super-2 number, since 2×18180418446² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2007481 + ... + 2016516.

It is an arithmetic number, because the mean of its divisors is an integer number (1647827181).

Almost surely, 2^18180418446 is an apocalyptic number.

18180418446 is an abundant number, since it is smaller than the sum of its proper divisors (21367433898).

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

18180418446 is a wasteful number, since it uses less digits than its factorization.

18180418446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024256 (or 4024253 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 45.

The spelling of 18180418446 in words is "eighteen billion, one hundred eighty million, four hundred eighteen thousand, four hundred forty-six".