165565156566 has 16 divisors (see below), whose sum is σ = 331292736000. Its totient is φ = 55161315048.

The previous prime is 165565156529. The next prime is 165565156579. The reversal of 165565156566 is 665651565561.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6754366 + ... + 6778833.

It is an arithmetic number, because the mean of its divisors is an integer number (20705796000).

Almost surely, 2^165565156566 is an apocalyptic number.

165565156566 is an abundant number, since it is smaller than the sum of its proper divisors (165727579434).

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

165565156566 is a wasteful number, since it uses less digits than its factorization.

165565156566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13535243.

The product of its digits is 24300000, while the sum is 57.

The spelling of 165565156566 in words is "one hundred sixty-five billion, five hundred sixty-five million, one hundred fifty-six thousand, five hundred sixty-six".