165664531 has 2 divisors, whose sum is σ = 165664532. Its totient is φ = 165664530.

The previous prime is 165664493. The next prime is 165664537. The reversal of 165664531 is 135466561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165664531 - 2⁹ = 165664019 is a prime.

It is a super-2 number, since 2×165664531² = 54889473662899922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165664537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82832265 + 82832266.

It is an arithmetic number, because the mean of its divisors is an integer number (82832266).

Almost surely, 2^165664531 is an apocalyptic number.

165664531 is a deficient number, since it is larger than the sum of its proper divisors (1).

165664531 is an equidigital number, since it uses as much as digits as its factorization.

165664531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 37.

The square root of 165664531 is about 12871.0734206592. The cubic root of 165664531 is about 549.2159970157.

The spelling of 165664531 in words is "one hundred sixty-five million, six hundred sixty-four thousand, five hundred thirty-one".