165663813953 has 8 divisors (see below), whose sum is σ = 184569356160. Its totient is φ = 147399137680.

The previous prime is 165663813947. The next prime is 165663813979. The reversal of 165663813953 is 359318366561.

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

It is a cyclic number.

It is not a de Polignac number, because 165663813953 - 2²⁰ = 165662765377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165663812953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160215938 + ... + 160216971.

It is an arithmetic number, because the mean of its divisors is an integer number (23071169520).

Almost surely, 2^165663813953 is an apocalyptic number.

It is an amenable number.

165663813953 is a deficient number, since it is larger than the sum of its proper divisors (18905542207).

165663813953 is a wasteful number, since it uses less digits than its factorization.

165663813953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320432967.

The product of its digits is 10497600, while the sum is 56.

The spelling of 165663813953 in words is "one hundred sixty-five billion, six hundred sixty-three million, eight hundred thirteen thousand, nine hundred fifty-three".