165491597 has 8 divisors (see below), whose sum is σ = 168428952. Its totient is φ = 162561600.

The previous prime is 165491591. The next prime is 165491611. The reversal of 165491597 is 795194561.

It can be written as a sum of positive squares in 4 ways, for example, as 3031081 + 162460516 = 1741^2 + 12746^2 .

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 165491597 - 2⁴ = 165491581 is a prime.

It is a super-2 number, since 2×165491597² = 54774937355220818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165491591) 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, 63443 + ... + 65999.

It is an arithmetic number, because the mean of its divisors is an integer number (21053619).

Almost surely, 2^165491597 is an apocalyptic number.

It is an amenable number.

165491597 is a deficient number, since it is larger than the sum of its proper divisors (2937355).

165491597 is a wasteful number, since it uses less digits than its factorization.

165491597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679.

The product of its digits is 340200, while the sum is 47.

The square root of 165491597 is about 12864.3537342534. The cubic root of 165491597 is about 549.0248251609.

The spelling of 165491597 in words is "one hundred sixty-five million, four hundred ninety-one thousand, five hundred ninety-seven".