165986959 has 2 divisors, whose sum is σ = 165986960. Its totient is φ = 165986958.

The previous prime is 165986941. The next prime is 165986993. The reversal of 165986959 is 959689561.

165986959 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (959689561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165986959 - 2¹³ = 165978767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165986999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82993479 + 82993480.

It is an arithmetic number, because the mean of its divisors is an integer number (82993480).

Almost surely, 2^165986959 is an apocalyptic number.

165986959 is a deficient number, since it is larger than the sum of its proper divisors (1).

165986959 is an equidigital number, since it uses as much as digits as its factorization.

165986959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5248800, while the sum is 58.

The square root of 165986959 is about 12883.5926278348. The cubic root of 165986959 is about 549.5720737509.

The spelling of 165986959 in words is "one hundred sixty-five million, nine hundred eighty-six thousand, nine hundred fifty-nine".