165210557 has 4 divisors (see below), whose sum is σ = 165306240. Its totient is φ = 165114876.

The previous prime is 165210523. The next prime is 165210569. The reversal of 165210557 is 755012561.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165210557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165210457) 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, 45203 + ... + 48720.

It is an arithmetic number, because the mean of its divisors is an integer number (41326560).

Almost surely, 2^165210557 is an apocalyptic number.

It is an amenable number.

165210557 is a deficient number, since it is larger than the sum of its proper divisors (95683).

165210557 is an equidigital number, since it uses as much as digits as its factorization.

165210557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95682.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 165210557 is about 12853.4258857318. The cubic root of 165210557 is about 548.7138620148.

The spelling of 165210557 in words is "one hundred sixty-five million, two hundred ten thousand, five hundred fifty-seven".