80165809 has 2 divisors, whose sum is σ = 80165810. Its totient is φ = 80165808.

The previous prime is 80165737. The next prime is 80165849. The reversal of 80165809 is 90856108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70224400 + 9941409 = 8380^2 + 3153^2 .

It is a cyclic number.

It is not a de Polignac number, because 80165809 - 2⁹ = 80165297 is a prime.

It is not a weakly prime, because it can be changed into another prime (80165849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40082904 + 40082905.

It is an arithmetic number, because the mean of its divisors is an integer number (40082905).

Almost surely, 2^80165809 is an apocalyptic number.

It is an amenable number.

80165809 is a deficient number, since it is larger than the sum of its proper divisors (1).

80165809 is an equidigital number, since it uses as much as digits as its factorization.

80165809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 80165809 is about 8953.5361170880. The cubic root of 80165809 is about 431.1844197974.

The spelling of 80165809 in words is "eighty million, one hundred sixty-five thousand, eight hundred nine".