165597361 has 8 divisors (see below), whose sum is σ = 168314184. Its totient is φ = 162892800.

The previous prime is 165597353. The next prime is 165597379. The reversal of 165597361 is 163795561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 43362225 + 122235136 = 6585^2 + 11056^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165597361 - 2³ = 165597353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165597301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26445 + ... + 32101.

It is an arithmetic number, because the mean of its divisors is an integer number (21039273).

Almost surely, 2^165597361 is an apocalyptic number.

It is an amenable number.

165597361 is a deficient number, since it is larger than the sum of its proper divisors (2716823).

165597361 is an equidigital number, since it uses as much as digits as its factorization.

165597361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131.

The product of its digits is 170100, while the sum is 43.

The square root of 165597361 is about 12868.4638166333. The cubic root of 165597361 is about 549.1417589852.

The spelling of 165597361 in words is "one hundred sixty-five million, five hundred ninety-seven thousand, three hundred sixty-one".