18660512720 has 40 divisors (see below), whose sum is σ = 45272030976. Its totient is φ = 7139673728.

The previous prime is 18660512719. The next prime is 18660512797. The reversal of 18660512720 is 2721506681.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5068952 + ... + 5072631.

Almost surely, 2^18660512720 is an apocalyptic number.

18660512720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18660512720 is an abundant number, since it is smaller than the sum of its proper divisors (26611518256).

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

18660512720 is a wasteful number, since it uses less digits than its factorization.

18660512720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10141619 (or 10141613 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 18660512720 in words is "eighteen billion, six hundred sixty million, five hundred twelve thousand, seven hundred twenty".