165516625 has 16 divisors (see below), whose sum is σ = 215549568. Its totient is φ = 126654000.

The previous prime is 165516583. The next prime is 165516643. The reversal of 165516625 is 526615561.

It is not a de Polignac number, because 165516625 - 2¹¹ = 165514577 is a prime.

It is a Duffinian 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, 25911 + ... + 31660.

It is an arithmetic number, because the mean of its divisors is an integer number (13471848).

Almost surely, 2^165516625 is an apocalyptic number.

It is an amenable number.

165516625 is a deficient number, since it is larger than the sum of its proper divisors (50032943).

165516625 is an equidigital number, since it uses as much as digits as its factorization.

165516625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57609 (or 57599 counting only the distinct ones).

The product of its digits is 54000, while the sum is 37.

The square root of 165516625 is about 12865.3264630168. The cubic root of 165516625 is about 549.0525008877.

The spelling of 165516625 in words is "one hundred sixty-five million, five hundred sixteen thousand, six hundred twenty-five".