18666560 has 56 divisors (see below), whose sum is σ = 48499776. Its totient is φ = 6786560.

The previous prime is 18666541. The next prime is 18666563. The reversal of 18666560 is 6566681.

It is not an unprimeable number, because it can be changed into a prime (18666563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869 + ... + 6171.

Almost surely, 2^18666560 is an apocalyptic number.

18666560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18666560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24249888).

18666560 is an abundant number, since it is smaller than the sum of its proper divisors (29833216).

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

18666560 is a wasteful number, since it uses less digits than its factorization.

18666560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331 (or 5321 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 18666560 is about 4320.4814546529. The cubic root of 18666560 is about 265.2699752484.

The spelling of 18666560 in words is "eighteen million, six hundred sixty-six thousand, five hundred sixty".