165580091 has 2 divisors, whose sum is σ = 165580092. Its totient is φ = 165580090.

The previous prime is 165580087. The next prime is 165580097. The reversal of 165580091 is 190085561.

It is a weak prime.

It is an emirp because it is prime and its reverse (190085561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165580091 - 2² = 165580087 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (165580097) 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, 82790045 + 82790046.

It is an arithmetic number, because the mean of its divisors is an integer number (82790046).

Almost surely, 2^165580091 is an apocalyptic number.

165580091 is a deficient number, since it is larger than the sum of its proper divisors (1).

165580091 is an equidigital number, since it uses as much as digits as its factorization.

165580091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 165580091 is about 12867.7927788724. The cubic root of 165580091 is about 549.1226684880.

The spelling of 165580091 in words is "one hundred sixty-five million, five hundred eighty thousand, ninety-one".