165645659 has 2 divisors, whose sum is σ = 165645660. Its totient is φ = 165645658.

The previous prime is 165645611. The next prime is 165645661. The reversal of 165645659 is 956546561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165645659 - 2¹⁶ = 165580123 is a prime.

Together with 165645661, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165645859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82822829 + 82822830.

It is an arithmetic number, because the mean of its divisors is an integer number (82822830).

Almost surely, 2^165645659 is an apocalyptic number.

165645659 is a deficient number, since it is larger than the sum of its proper divisors (1).

165645659 is an equidigital number, since it uses as much as digits as its factorization.

165645659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 47.

The square root of 165645659 is about 12870.3402829917. The cubic root of 165645659 is about 549.1951412179.

The spelling of 165645659 in words is "one hundred sixty-five million, six hundred forty-five thousand, six hundred fifty-nine".