165750940309 has 2 divisors, whose sum is σ = 165750940310. Its totient is φ = 165750940308.

The previous prime is 165750940307. The next prime is 165750940339. The reversal of 165750940309 is 903049057561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103585491409 + 62165448900 = 321847^2 + 249330^2 .

It is a cyclic number.

It is not a de Polignac number, because 165750940309 - 2¹ = 165750940307 is a prime.

Together with 165750940307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165750940307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82875470154 + 82875470155.

It is an arithmetic number, because the mean of its divisors is an integer number (82875470155).

Almost surely, 2^165750940309 is an apocalyptic number.

It is an amenable number.

165750940309 is a deficient number, since it is larger than the sum of its proper divisors (1).

165750940309 is an equidigital number, since it uses as much as digits as its factorization.

165750940309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The spelling of 165750940309 in words is "one hundred sixty-five billion, seven hundred fifty million, nine hundred forty thousand, three hundred nine".