18477139232 has 24 divisors (see below), whose sum is σ = 36431942652. Its totient is φ = 9224582400.

The previous prime is 18477139223. The next prime is 18477139237. The reversal of 18477139232 is 23293177481.

It can be written as a sum of positive squares in 2 ways, for example, as 17999978896 + 477160336 = 134164^2 + 21844^2 .

It is not an unprimeable number, because it can be changed into a prime (18477139237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415619 + ... + 457922.

Almost surely, 2^18477139232 is an apocalyptic number.

It is an amenable number.

18477139232 is a deficient number, since it is larger than the sum of its proper divisors (17954803420).

18477139232 is an equidigital number, since it uses as much as digits as its factorization.

18477139232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874212 (or 874204 counting only the distinct ones).

The product of its digits is 508032, while the sum is 47.

The spelling of 18477139232 in words is "eighteen billion, four hundred seventy-seven million, one hundred thirty-nine thousand, two hundred thirty-two".