165518490 has 32 divisors (see below), whose sum is σ = 405699840. Its totient is φ = 43198784.

The previous prime is 165518473. The next prime is 165518491. The reversal of 165518490 is 94815561.

It is not an unprimeable number, because it can be changed into a prime (165518491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57285 + ... + 60104.

It is an arithmetic number, because the mean of its divisors is an integer number (12678120).

Almost surely, 2^165518490 is an apocalyptic number.

165518490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165518490 is an abundant number, since it is smaller than the sum of its proper divisors (240181350).

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

165518490 is a wasteful number, since it uses less digits than its factorization.

165518490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117446.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 165518490 is about 12865.3989444556. The cubic root of 165518490 is about 549.0545630754.

The spelling of 165518490 in words is "one hundred sixty-five million, five hundred eighteen thousand, four hundred ninety".