165569856655 has 32 divisors (see below), whose sum is σ = 227978851968. Its totient is φ = 113078284800.

The previous prime is 165569856653. The next prime is 165569856721. The reversal of 165569856655 is 556658965561.

165569856655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165569856655 - 2¹ = 165569856653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165569856653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21952185 + ... + 21959725.

It is an arithmetic number, because the mean of its divisors is an integer number (7124339124).

Almost surely, 2^165569856655 is an apocalyptic number.

165569856655 is a deficient number, since it is larger than the sum of its proper divisors (62408995313).

165569856655 is a wasteful number, since it uses less digits than its factorization.

165569856655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9987.

The product of its digits is 291600000, while the sum is 67.

The spelling of 165569856655 in words is "one hundred sixty-five billion, five hundred sixty-nine million, eight hundred fifty-six thousand, six hundred fifty-five".