165957287 has 4 divisors (see below), whose sum is σ = 166015416. Its totient is φ = 165899160.

The previous prime is 165957277. The next prime is 165957359. The reversal of 165957287 is 782759561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165957287 - 2²² = 161762983 is a prime.

It is a super-2 number, since 2×165957287² = 55083642216800738, 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 (165957277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24548 + ... + 30569.

It is an arithmetic number, because the mean of its divisors is an integer number (41503854).

Almost surely, 2^165957287 is an apocalyptic number.

165957287 is a deficient number, since it is larger than the sum of its proper divisors (58129).

165957287 is an equidigital number, since it uses as much as digits as its factorization.

165957287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58128.

The product of its digits is 1058400, while the sum is 50.

The square root of 165957287 is about 12882.4410342140. The cubic root of 165957287 is about 549.5393244424.

The spelling of 165957287 in words is "one hundred sixty-five million, nine hundred fifty-seven thousand, two hundred eighty-seven".