165163657 has 4 divisors (see below), whose sum is σ = 165684996. Its totient is φ = 164642320.

The previous prime is 165163639. The next prime is 165163709. The reversal of 165163657 is 756361561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36772096 + 128391561 = 6064^2 + 11331^2 .

It is a cyclic number.

It is not a de Polignac number, because 165163657 - 2¹⁹ = 164639369 is a prime.

It is a super-2 number, since 2×165163657² = 54558067187227298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165163057) 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, 260194 + ... + 260827.

It is an arithmetic number, because the mean of its divisors is an integer number (41421249).

Almost surely, 2^165163657 is an apocalyptic number.

It is an amenable number.

165163657 is a deficient number, since it is larger than the sum of its proper divisors (521339).

165163657 is an equidigital number, since it uses as much as digits as its factorization.

165163657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521338.

The product of its digits is 113400, while the sum is 40.

The square root of 165163657 is about 12851.6013399109. The cubic root of 165163657 is about 548.6619341071.

The spelling of 165163657 in words is "one hundred sixty-five million, one hundred sixty-three thousand, six hundred fifty-seven".