165661085 has 16 divisors (see below), whose sum is σ = 203688000. Its totient is φ = 129300096.

The previous prime is 165661063. The next prime is 165661087. The reversal of 165661085 is 580166561.

It is a cyclic number.

It is not a de Polignac number, because 165661085 - 2¹⁴ = 165644701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165661087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38366 + ... + 42464.

It is an arithmetic number, because the mean of its divisors is an integer number (12730500).

Almost surely, 2^165661085 is an apocalyptic number.

It is an amenable number.

165661085 is a deficient number, since it is larger than the sum of its proper divisors (38026915).

165661085 is a wasteful number, since it uses less digits than its factorization.

165661085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 165661085 is about 12870.9395538943. The cubic root of 165661085 is about 549.2121888953.

The spelling of 165661085 in words is "one hundred sixty-five million, six hundred sixty-one thousand, eighty-five".