165618680 has 32 divisors (see below), whose sum is σ = 381734640. Its totient is φ = 64631040.

The previous prime is 165618679. The next prime is 165618703. The reversal of 165618680 is 86816561.

It is a happy number.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48854 + ... + 52133.

Almost surely, 2^165618680 is an apocalyptic number.

165618680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165618680 is an abundant number, since it is smaller than the sum of its proper divisors (216115960).

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

165618680 is a wasteful number, since it uses less digits than its factorization.

165618680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101039 (or 101035 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 165618680 is about 12869.2921328253. The cubic root of 165618680 is about 549.1653234726.

The spelling of 165618680 in words is "one hundred sixty-five million, six hundred eighteen thousand, six hundred eighty".