165044641 has 2 divisors, whose sum is σ = 165044642. Its totient is φ = 165044640.

The previous prime is 165044617. The next prime is 165044647. The reversal of 165044641 is 146440561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116100625 + 48944016 = 10775^2 + 6996^2 .

It is a cyclic number.

It is not a de Polignac number, because 165044641 - 2⁵ = 165044609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165044647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82522320 + 82522321.

It is an arithmetic number, because the mean of its divisors is an integer number (82522321).

Almost surely, 2^165044641 is an apocalyptic number.

It is an amenable number.

165044641 is a deficient number, since it is larger than the sum of its proper divisors (1).

165044641 is an equidigital number, since it uses as much as digits as its factorization.

165044641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 165044641 is about 12846.9701097185. The cubic root of 165044641 is about 548.5301148738.

The spelling of 165044641 in words is "one hundred sixty-five million, forty-four thousand, six hundred forty-one".