165597401 has 16 divisors (see below), whose sum is σ = 179722368. Its totient is φ = 152169600.

The previous prime is 165597379. The next prime is 165597413. The reversal of 165597401 is 104795561.

It is a cyclic number.

It is not a de Polignac number, because 165597401 - 2¹⁸ = 165335257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165597431) 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, 61871 + ... + 64491.

It is an arithmetic number, because the mean of its divisors is an integer number (11232648).

Almost surely, 2^165597401 is an apocalyptic number.

It is an amenable number.

165597401 is a deficient number, since it is larger than the sum of its proper divisors (14124967).

165597401 is a wasteful number, since it uses less digits than its factorization.

165597401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 165597401 is about 12868.4653708203. The cubic root of 165597401 is about 549.1418032002.

The spelling of 165597401 in words is "one hundred sixty-five million, five hundred ninety-seven thousand, four hundred one".