165122749409 has 2 divisors, whose sum is σ = 165122749410. Its totient is φ = 165122749408.

The previous prime is 165122749321. The next prime is 165122749507. The reversal of 165122749409 is 904947221561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83086333009 + 82036416400 = 288247^2 + 286420^2 .

It is a cyclic number.

It is not a de Polignac number, because 165122749409 - 2²⁰ = 165121700833 is a prime.

It is not a weakly prime, because it can be changed into another prime (165122739409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82561374704 + 82561374705.

It is an arithmetic number, because the mean of its divisors is an integer number (82561374705).

Almost surely, 2^165122749409 is an apocalyptic number.

It is an amenable number.

165122749409 is a deficient number, since it is larger than the sum of its proper divisors (1).

165122749409 is an equidigital number, since it uses as much as digits as its factorization.

165122749409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 165122749409 in words is "one hundred sixty-five billion, one hundred twenty-two million, seven hundred forty-nine thousand, four hundred nine".