165259953209 has 8 divisors (see below), whose sum is σ = 177975421512. Its totient is φ = 152544936960.

The previous prime is 165259953191. The next prime is 165259953239. The reversal of 165259953209 is 902359952561.

It can be written as a sum of positive squares in 4 ways, for example, as 2560663609 + 162699289600 = 50603^2 + 403360^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-165259953209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165259953239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1309529 + ... + 1430169.

It is an arithmetic number, because the mean of its divisors is an integer number (22246927689).

Almost surely, 2^165259953209 is an apocalyptic number.

It is an amenable number.

165259953209 is a deficient number, since it is larger than the sum of its proper divisors (12715468303).

165259953209 is a wasteful number, since it uses less digits than its factorization.

165259953209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226027.

The product of its (nonzero) digits is 6561000, while the sum is 56.

The spelling of 165259953209 in words is "one hundred sixty-five billion, two hundred fifty-nine million, nine hundred fifty-three thousand, two hundred nine".