18660578432 has 32 divisors (see below), whose sum is σ = 37730244720. Its totient is φ = 9191026944.

The previous prime is 18660578407. The next prime is 18660578437. The reversal of 18660578432 is 23487506681.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (18660578437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079378 + ... + 1096529.

Almost surely, 2^18660578432 is an apocalyptic number.

It is an amenable number.

18660578432 is an abundant number, since it is smaller than the sum of its proper divisors (19069666288).

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

18660578432 is an equidigital number, since it uses as much as digits as its factorization.

18660578432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175988 (or 2175976 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 18660578432 in words is "eighteen billion, six hundred sixty million, five hundred seventy-eight thousand, four hundred thirty-two".