165585439 has 2 divisors, whose sum is σ = 165585440. Its totient is φ = 165585438.

The previous prime is 165585421. The next prime is 165585443. The reversal of 165585439 is 934585561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165585439 - 2¹¹ = 165583391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165585449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82792719 + 82792720.

It is an arithmetic number, because the mean of its divisors is an integer number (82792720).

Almost surely, 2^165585439 is an apocalyptic number.

165585439 is a deficient number, since it is larger than the sum of its proper divisors (1).

165585439 is an equidigital number, since it uses as much as digits as its factorization.

165585439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 46.

The square root of 165585439 is about 12868.0005828411. Note that the first 3 decimals coincide. The cubic root of 165585439 is about 549.1285803831.

The spelling of 165585439 in words is "one hundred sixty-five million, five hundred eighty-five thousand, four hundred thirty-nine".