165533969 has 2 divisors, whose sum is σ = 165533970. Its totient is φ = 165533968.

The previous prime is 165533941. The next prime is 165533987. The reversal of 165533969 is 969335561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164352400 + 1181569 = 12820^2 + 1087^2 .

It is an emirp because it is prime and its reverse (969335561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165533969 - 2²⁰ = 164485393 is a prime.

It is a super-2 number, since 2×165533969² = 54802989785785922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165533939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82766984 + 82766985.

It is an arithmetic number, because the mean of its divisors is an integer number (82766985).

Almost surely, 2^165533969 is an apocalyptic number.

It is an amenable number.

165533969 is a deficient number, since it is larger than the sum of its proper divisors (1).

165533969 is an equidigital number, since it uses as much as digits as its factorization.

165533969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 656100, while the sum is 47.

The square root of 165533969 is about 12866.0005052075. Note that the first 3 decimals coincide. The cubic root of 165533969 is about 549.0716780831.

The spelling of 165533969 in words is "one hundred sixty-five million, five hundred thirty-three thousand, nine hundred sixty-nine".