165109247969 has 2 divisors, whose sum is σ = 165109247970. Its totient is φ = 165109247968.

The previous prime is 165109247957. The next prime is 165109248077. The reversal of 165109247969 is 969742901561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132996607969 + 32112640000 = 364687^2 + 179200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165109247969 is a prime.

It is a super-2 number, since 2×165109247969² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (165109247269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82554623984 + 82554623985.

It is an arithmetic number, because the mean of its divisors is an integer number (82554623985).

Almost surely, 2^165109247969 is an apocalyptic number.

It is an amenable number.

165109247969 is a deficient number, since it is larger than the sum of its proper divisors (1).

165109247969 is an equidigital number, since it uses as much as digits as its factorization.

165109247969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 165109247969 in words is "one hundred sixty-five billion, one hundred nine million, two hundred forty-seven thousand, nine hundred sixty-nine".