2565226165 has 16 divisors (see below), whose sum is σ = 3110286960. Its totient is φ = 2030883840.

The previous prime is 2565226163. The next prime is 2565226171. The reversal of 2565226165 is 5616225652.

It can be written as a sum of positive squares in 8 ways, for example, as 159617956 + 2405608209 = 12634^2 + 49047^2 .

It is not a de Polignac number, because 2565226165 - 2¹ = 2565226163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565226163) 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, 541005 + ... + 545725.

It is an arithmetic number, because the mean of its divisors is an integer number (194392935).

Almost surely, 2^2565226165 is an apocalyptic number.

It is an amenable number.

2565226165 is a deficient number, since it is larger than the sum of its proper divisors (545060795).

2565226165 is a wasteful number, since it uses less digits than its factorization.

2565226165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5832.

The product of its digits is 216000, while the sum is 40.

The square root of 2565226165 is about 50648.0618089182. The cubic root of 2565226165 is about 1368.9110221383.

The spelling of 2565226165 in words is "two billion, five hundred sixty-five million, two hundred twenty-six thousand, one hundred sixty-five".