165565370765 has 16 divisors (see below), whose sum is σ = 200098004400. Its totient is φ = 131506690560.

The previous prime is 165565370753. The next prime is 165565370783. The reversal of 165565370765 is 567073565561.

It can be written as a sum of positive squares in 8 ways, for example, as 71597986084 + 93967384681 = 267578^2 + 306541^2 .

It is not a de Polignac number, because 165565370765 - 2¹⁰ = 165565369741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165565370765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1727177 + ... + 1820513.

It is an arithmetic number, because the mean of its divisors is an integer number (12506125275).

Almost surely, 2^165565370765 is an apocalyptic number.

It is an amenable number.

165565370765 is a deficient number, since it is larger than the sum of its proper divisors (34532633635).

165565370765 is a wasteful number, since it uses less digits than its factorization.

165565370765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95872.

The product of its (nonzero) digits is 19845000, while the sum is 56.

The spelling of 165565370765 in words is "one hundred sixty-five billion, five hundred sixty-five million, three hundred seventy thousand, seven hundred sixty-five".