18165680 has 40 divisors (see below), whose sum is σ = 45486672. Its totient is φ = 6706944.

The previous prime is 18165647. The next prime is 18165683. The reversal of 18165680 is 8656181.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18165680.

It is not an unprimeable number, because it can be changed into a prime (18165683) 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, 7694 + ... + 9773.

Almost surely, 2^18165680 is an apocalyptic number.

18165680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18165680 is an abundant number, since it is smaller than the sum of its proper divisors (27320992).

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

18165680 is a wasteful number, since it uses less digits than its factorization.

18165680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17493 (or 17487 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18165680 is about 4262.1215374506. The cubic root of 18165680 is about 262.8757672014.

The spelling of 18165680 in words is "eighteen million, one hundred sixty-five thousand, six hundred eighty".