165597937 has 4 divisors (see below), whose sum is σ = 168069616. Its totient is φ = 163126260.

The previous prime is 165597919. The next prime is 165597961. The reversal of 165597937 is 739795561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 739795561 = 5393 ⋅137177.

It is a cyclic number.

It is not a de Polignac number, because 165597937 - 2¹¹ = 165595889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165597437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1235739 + ... + 1235872.

It is an arithmetic number, because the mean of its divisors is an integer number (42017404).

Almost surely, 2^165597937 is an apocalyptic number.

It is an amenable number.

165597937 is a deficient number, since it is larger than the sum of its proper divisors (2471679).

165597937 is an equidigital number, since it uses as much as digits as its factorization.

165597937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471678.

The product of its digits is 1786050, while the sum is 52.

The square root of 165597937 is about 12868.4861969075. The cubic root of 165597937 is about 549.1423956807.

The spelling of 165597937 in words is "one hundred sixty-five million, five hundred ninety-seven thousand, nine hundred thirty-seven".