165251515668 has 12 divisors (see below), whose sum is σ = 385586869920. Its totient is φ = 55083838552.

The previous prime is 165251515607. The next prime is 165251515733. The reversal of 165251515668 is 866515152561.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 165251515668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6885479808 + ... + 6885479831.

It is an arithmetic number, because the mean of its divisors is an integer number (32132239160).

Almost surely, 2^165251515668 is an apocalyptic number.

It is an amenable number.

165251515668 is an abundant number, since it is smaller than the sum of its proper divisors (220335354252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165251515668 is a wasteful number, since it uses less digits than its factorization.

165251515668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13770959646 (or 13770959644 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 51.

The spelling of 165251515668 in words is "one hundred sixty-five billion, two hundred fifty-one million, five hundred fifteen thousand, six hundred sixty-eight".