165994280 has 32 divisors (see below), whose sum is σ = 375459840. Its totient is φ = 66047040.

The previous prime is 165994259. The next prime is 165994303. The reversal of 165994280 is 82499561.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3224 + ... + 18503.

It is an arithmetic number, because the mean of its divisors is an integer number (11733120).

Almost surely, 2^165994280 is an apocalyptic number.

165994280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165994280 is an abundant number, since it is smaller than the sum of its proper divisors (209465560).

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

165994280 is a wasteful number, since it uses less digits than its factorization.

165994280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21929 (or 21925 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 165994280 is about 12883.8767457625. The cubic root of 165994280 is about 549.5801534177.

The spelling of 165994280 in words is "one hundred sixty-five million, nine hundred ninety-four thousand, two hundred eighty".