2565225660 has 24 divisors (see below), whose sum is σ = 7182632016. Its totient is φ = 684060160.

The previous prime is 2565225647. The next prime is 2565225661. The reversal of 2565225660 is 665225652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565225661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21376821 + ... + 21376940.

It is an arithmetic number, because the mean of its divisors is an integer number (299276334).

Almost surely, 2^2565225660 is an apocalyptic number.

2565225660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2565225660 is an abundant number, since it is smaller than the sum of its proper divisors (4617406356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2565225660 is a wasteful number, since it uses less digits than its factorization.

2565225660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42753773 (or 42753771 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 2565225660 is about 50648.0568235347. The cubic root of 2565225660 is about 1368.9109323087.

The spelling of 2565225660 in words is "two billion, five hundred sixty-five million, two hundred twenty-five thousand, six hundred sixty".