165565855 has 48 divisors (see below), whose sum is σ = 251082720. Its totient is φ = 103880448.

The previous prime is 165565853. The next prime is 165565879. The reversal of 165565855 is 558565561.

It is a happy number.

It is not a de Polignac number, because 165565855 - 2¹ = 165565853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165565853) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 722881 + ... + 723109.

It is an arithmetic number, because the mean of its divisors is an integer number (5230890).

Almost surely, 2^165565855 is an apocalyptic number.

165565855 is a deficient number, since it is larger than the sum of its proper divisors (85516865).

165565855 is a wasteful number, since it uses less digits than its factorization.

165565855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 481 counting only the distinct ones).

The product of its digits is 900000, while the sum is 46.

The square root of 165565855 is about 12867.2396029607. The cubic root of 165565855 is about 549.1069308182.

The spelling of 165565855 in words is "one hundred sixty-five million, five hundred sixty-five thousand, eight hundred fifty-five".