165899220 has 48 divisors (see below), whose sum is σ = 468877248. Its totient is φ = 43824640.

The previous prime is 165899213. The next prime is 165899257. The reversal of 165899220 is 22998561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6501 + ... + 19340.

It is an arithmetic number, because the mean of its divisors is an integer number (9768276).

Almost surely, 2^165899220 is an apocalyptic number.

165899220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165899220 is an abundant number, since it is smaller than the sum of its proper divisors (302978028).

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

165899220 is a wasteful number, since it uses less digits than its factorization.

165899220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25960 (or 25958 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 165899220 is about 12880.1871104421. The cubic root of 165899220 is about 549.4752239683.

The spelling of 165899220 in words is "one hundred sixty-five million, eight hundred ninety-nine thousand, two hundred twenty".