165399667 has 2 divisors, whose sum is σ = 165399668. Its totient is φ = 165399666.

The previous prime is 165399659. The next prime is 165399671. The reversal of 165399667 is 766993561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165399667 - 2³ = 165399659 is a prime.

It is not a weakly prime, because it can be changed into another prime (165399607) 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, 82699833 + 82699834.

It is an arithmetic number, because the mean of its divisors is an integer number (82699834).

Almost surely, 2^165399667 is an apocalyptic number.

165399667 is a deficient number, since it is larger than the sum of its proper divisors (1).

165399667 is an equidigital number, since it uses as much as digits as its factorization.

165399667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 52.

The square root of 165399667 is about 12860.7801862873. The cubic root of 165399667 is about 548.9231458780.

The spelling of 165399667 in words is "one hundred sixty-five million, three hundred ninety-nine thousand, six hundred sixty-seven".