165920851 has 2 divisors, whose sum is σ = 165920852. Its totient is φ = 165920850.

The previous prime is 165920813. The next prime is 165920879. The reversal of 165920851 is 158029561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165920851 - 2⁷ = 165920723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165920851.

It is not a weakly prime, because it can be changed into another prime (165920351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82960425 + 82960426.

It is an arithmetic number, because the mean of its divisors is an integer number (82960426).

Almost surely, 2^165920851 is an apocalyptic number.

165920851 is a deficient number, since it is larger than the sum of its proper divisors (1).

165920851 is an equidigital number, since it uses as much as digits as its factorization.

165920851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 165920851 is about 12881.0267836070. The cubic root of 165920851 is about 549.4991042936.

The spelling of 165920851 in words is "one hundred sixty-five million, nine hundred twenty thousand, eight hundred fifty-one".