165581303 has 2 divisors, whose sum is σ = 165581304. Its totient is φ = 165581302.

The previous prime is 165581281. The next prime is 165581359. The reversal of 165581303 is 303185561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165581303 - 2⁶ = 165581239 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165581303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165581803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82790651 + 82790652.

It is an arithmetic number, because the mean of its divisors is an integer number (82790652).

Almost surely, 2^165581303 is an apocalyptic number.

165581303 is a deficient number, since it is larger than the sum of its proper divisors (1).

165581303 is an equidigital number, since it uses as much as digits as its factorization.

165581303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 165581303 is about 12867.8398731100. The cubic root of 165581303 is about 549.1240082929.

The spelling of 165581303 in words is "one hundred sixty-five million, five hundred eighty-one thousand, three hundred three".