165656369 has 2 divisors, whose sum is σ = 165656370. Its totient is φ = 165656368.

The previous prime is 165656357. The next prime is 165656371. The reversal of 165656369 is 963656561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98743969 + 66912400 = 9937^2 + 8180^2 .

It is a cyclic number.

It is not a de Polignac number, because 165656369 - 2⁴ = 165656353 is a prime.

It is a super-2 number, since 2×165656369² = 54884065180528322, which contains 22 as substring.

Together with 165656371, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (165656389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82828184 + 82828185.

It is an arithmetic number, because the mean of its divisors is an integer number (82828185).

Almost surely, 2^165656369 is an apocalyptic number.

It is an amenable number.

165656369 is a deficient number, since it is larger than the sum of its proper divisors (1).

165656369 is an equidigital number, since it uses as much as digits as its factorization.

165656369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 47.

The square root of 165656369 is about 12870.7563491817. The cubic root of 165656369 is about 549.2069772323.

The spelling of 165656369 in words is "one hundred sixty-five million, six hundred fifty-six thousand, three hundred sixty-nine".