2625221565 has 12 divisors (see below), whose sum is σ = 4550384124. Its totient is φ = 1400118144.

The previous prime is 2625221539. The next prime is 2625221569. The reversal of 2625221565 is 5651225262.

2625221565 is a `hidden beast` number, since 2 + 62 + 522 + 15 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 401721849 + 2223499716 = 20043^2 + 47154^2 .

It is not a de Polignac number, because 2625221565 - 2²³ = 2616832957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2625221569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29169084 + ... + 29169173.

It is an arithmetic number, because the mean of its divisors is an integer number (379198677).

Almost surely, 2^2625221565 is an apocalyptic number.

It is an amenable number.

2625221565 is a deficient number, since it is larger than the sum of its proper divisors (1925162559).

2625221565 is a wasteful number, since it uses less digits than its factorization.

2625221565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58338268 (or 58338265 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 2625221565 is about 51236.9160371699. The cubic root of 2625221565 is about 1379.5008985929.

The spelling of 2625221565 in words is "two billion, six hundred twenty-five million, two hundred twenty-one thousand, five hundred sixty-five".