165664319 has 2 divisors, whose sum is σ = 165664320. Its totient is φ = 165664318.

The previous prime is 165664307. The next prime is 165664357. The reversal of 165664319 is 913466561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165664319 - 2²⁴ = 148887103 is a prime.

It is a super-2 number, since 2×165664319² = 54889333179467522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165664019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82832159 + 82832160.

It is an arithmetic number, because the mean of its divisors is an integer number (82832160).

Almost surely, 2^165664319 is an apocalyptic number.

165664319 is a deficient number, since it is larger than the sum of its proper divisors (1).

165664319 is an equidigital number, since it uses as much as digits as its factorization.

165664319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 165664319 is about 12871.0651851352. The cubic root of 165664319 is about 549.2157627394.

The spelling of 165664319 in words is "one hundred sixty-five million, six hundred sixty-four thousand, three hundred nineteen".