2565097566 has 16 divisors (see below), whose sum is σ = 5158857600. Its totient is φ = 850255448.

The previous prime is 2565097559. The next prime is 2565097571. The reversal of 2565097566 is 6657905652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1193106 + ... + 1195253.

It is an arithmetic number, because the mean of its divisors is an integer number (322428600).

Almost surely, 2^2565097566 is an apocalyptic number.

2565097566 is an abundant number, since it is smaller than the sum of its proper divisors (2593760034).

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

2565097566 is a wasteful number, since it uses less digits than its factorization.

2565097566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388543.

The product of its (nonzero) digits is 3402000, while the sum is 51.

The square root of 2565097566 is about 50646.7922577531. The cubic root of 2565097566 is about 1368.8881465036. Note that the first 3 decimals are identical.

The spelling of 2565097566 in words is "two billion, five hundred sixty-five million, ninety-seven thousand, five hundred sixty-six".