165925590 has 16 divisors (see below), whose sum is σ = 398221488. Its totient is φ = 44246816.

The previous prime is 165925583. The next prime is 165925601. The reversal of 165925590 is 95529561.

It is a congruent number.

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, 2765397 + ... + 2765456.

It is an arithmetic number, because the mean of its divisors is an integer number (24888843).

Almost surely, 2^165925590 is an apocalyptic number.

165925590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165925590 is an abundant number, since it is smaller than the sum of its proper divisors (232295898).

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

165925590 is a wasteful number, since it uses less digits than its factorization.

165925590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530863.

The product of its (nonzero) digits is 121500, while the sum is 42.

The square root of 165925590 is about 12881.2107350202. The cubic root of 165925590 is about 549.5043358070.

The spelling of 165925590 in words is "one hundred sixty-five million, nine hundred twenty-five thousand, five hundred ninety".