18660155664 has 40 divisors (see below), whose sum is σ = 50742531040. Its totient is φ = 5892680448.

The previous prime is 18660155663. The next prime is 18660155707. The reversal of 18660155664 is 46655106681.

It is a super-2 number, since 2×18660155664² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (18660155663) 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 7 ways as a sum of consecutive naturals, for example, 10229437 + ... + 10231260.

It is an arithmetic number, because the mean of its divisors is an integer number (1268563276).

Almost surely, 2^18660155664 is an apocalyptic number.

It is an amenable number.

18660155664 is an abundant number, since it is smaller than the sum of its proper divisors (32082375376).

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

18660155664 is a wasteful number, since it uses less digits than its factorization.

18660155664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20460727 (or 20460721 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 18660155664 in words is "eighteen billion, six hundred sixty million, one hundred fifty-five thousand, six hundred sixty-four".