165980808 has 96 divisors (see below), whose sum is σ = 540820800. Its totient is φ = 44924544.

The previous prime is 165980791. The next prime is 165980813. The reversal of 165980808 is 808089561.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 910 + ... + 18242.

It is an arithmetic number, because the mean of its divisors is an integer number (5633550).

Almost surely, 2^165980808 is an apocalyptic number.

165980808 is a gapful number since it is divisible by the number (18) 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 165980808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270410400).

165980808 is an abundant number, since it is smaller than the sum of its proper divisors (374839992).

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

165980808 is a wasteful number, since it uses less digits than its factorization.

165980808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17371 (or 17364 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 165980808 is about 12883.3539111522. The cubic root of 165980808 is about 549.5652851461.

The spelling of 165980808 in words is "one hundred sixty-five million, nine hundred eighty thousand, eight hundred eight".