165444953309 has 16 divisors (see below), whose sum is σ = 178496654400. Its totient is φ = 152772489984.

The previous prime is 165444953257. The next prime is 165444953321. The reversal of 165444953309 is 903359444561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165444953309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165444953809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348494 + ... + 672560.

It is an arithmetic number, because the mean of its divisors is an integer number (11156040900).

Almost surely, 2^165444953309 is an apocalyptic number.

It is an amenable number.

165444953309 is a deficient number, since it is larger than the sum of its proper divisors (13051701091).

165444953309 is a wasteful number, since it uses less digits than its factorization.

165444953309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324652.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 165444953309 in words is "one hundred sixty-five billion, four hundred forty-four million, nine hundred fifty-three thousand, three hundred nine".