165806959 has 2 divisors, whose sum is σ = 165806960. Its totient is φ = 165806958.

The previous prime is 165806923. The next prime is 165806983. The reversal of 165806959 is 959608561.

165806959 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165806959 - 2¹⁹ = 165282671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165806059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82903479 + 82903480.

It is an arithmetic number, because the mean of its divisors is an integer number (82903480).

Almost surely, 2^165806959 is an apocalyptic number.

165806959 is a deficient number, since it is larger than the sum of its proper divisors (1).

165806959 is an equidigital number, since it uses as much as digits as its factorization.

165806959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 165806959 is about 12876.6051038307. The cubic root of 165806959 is about 549.3733457835.

The spelling of 165806959 in words is "one hundred sixty-five million, eight hundred six thousand, nine hundred fifty-nine".