165399659 has 2 divisors, whose sum is σ = 165399660. Its totient is φ = 165399658.

The previous prime is 165399653. The next prime is 165399667. The reversal of 165399659 is 956993561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165399659 - 2⁴ = 165399643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165399659.

It is not a weakly prime, because it can be changed into another prime (165399653) 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 as a sum of consecutive naturals, namely, 82699829 + 82699830.

It is an arithmetic number, because the mean of its divisors is an integer number (82699830).

Almost surely, 2^165399659 is an apocalyptic number.

165399659 is a deficient number, since it is larger than the sum of its proper divisors (1).

165399659 is an equidigital number, since it uses as much as digits as its factorization.

165399659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1968300, while the sum is 53.

The square root of 165399659 is about 12860.7798752642. The cubic root of 165399659 is about 548.9231370280.

The spelling of 165399659 in words is "one hundred sixty-five million, three hundred ninety-nine thousand, six hundred fifty-nine".