165533939 has 2 divisors, whose sum is σ = 165533940. Its totient is φ = 165533938.

The previous prime is 165533917. The next prime is 165533941. The reversal of 165533939 is 939335561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165533939 is a prime.

Together with 165533941, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165533939.

It is not a weakly prime, because it can be changed into another prime (165533969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82766969 + 82766970.

It is an arithmetic number, because the mean of its divisors is an integer number (82766970).

Almost surely, 2^165533939 is an apocalyptic number.

165533939 is a deficient number, since it is larger than the sum of its proper divisors (1).

165533939 is an equidigital number, since it uses as much as digits as its factorization.

165533939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 328050, while the sum is 44.

The square root of 165533939 is about 12865.9993393440. Note that the first 3 decimals coincide. The cubic root of 165533939 is about 549.0716449134.

The spelling of 165533939 in words is "one hundred sixty-five million, five hundred thirty-three thousand, nine hundred thirty-nine".