165601065 has 16 divisors (see below), whose sum is σ = 302813568. Its totient is φ = 75703296.

The previous prime is 165601061. The next prime is 165601099. The reversal of 165601065 is 560106561.

It is not a de Polignac number, because 165601065 - 2² = 165601061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165601061) 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, 788472 + ... + 788681.

It is an arithmetic number, because the mean of its divisors is an integer number (18925848).

Almost surely, 2^165601065 is an apocalyptic number.

165601065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165601065 is a deficient number, since it is larger than the sum of its proper divisors (137212503).

165601065 is a wasteful number, since it uses less digits than its factorization.

165601065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577168.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 165601065 is about 12868.6077335507. The cubic root of 165601065 is about 549.1458532652.

The spelling of 165601065 in words is "one hundred sixty-five million, six hundred one thousand, sixty-five".