165870111265 has 16 divisors (see below), whose sum is σ = 201792805200. Its totient is φ = 130864038912.

The previous prime is 165870111263. The next prime is 165870111271. The reversal of 165870111265 is 562111078561.

It can be written as a sum of positive squares in 8 ways, for example, as 64786401 + 165805324864 = 8049^2 + 407192^2 .

It is a cyclic number.

It is not a de Polignac number, because 165870111265 - 2¹ = 165870111263 is a prime.

It is a super-2 number, since 2×165870111265² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165870111263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4401021 + ... + 4438549.

It is an arithmetic number, because the mean of its divisors is an integer number (12612050325).

Almost surely, 2^165870111265 is an apocalyptic number.

It is an amenable number.

165870111265 is a deficient number, since it is larger than the sum of its proper divisors (35922693935).

165870111265 is a wasteful number, since it uses less digits than its factorization.

165870111265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49716.

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 165870111265 in words is "one hundred sixty-five billion, eight hundred seventy million, one hundred eleven thousand, two hundred sixty-five".