165440625 has 48 divisors (see below), whose sum is σ = 315229824. Its totient is φ = 75600000.

The previous prime is 165440623. The next prime is 165440641. The reversal of 165440625 is 526044561.

It is not a de Polignac number, because 165440625 - 2¹ = 165440623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165440623) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64365 + ... + 66885.

It is an arithmetic number, because the mean of its divisors is an integer number (6567288).

Almost surely, 2^165440625 is an apocalyptic number.

165440625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165440625 is a deficient number, since it is larger than the sum of its proper divisors (149789199).

165440625 is an frugal number, since it uses more digits than its factorization.

165440625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 2536 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 165440625 is about 12862.3724483472. The cubic root of 165440625 is about 548.9684521737.

The spelling of 165440625 in words is "one hundred sixty-five million, four hundred forty thousand, six hundred twenty-five".