2565243061 has 4 divisors (see below), whose sum is σ = 2676775392. Its totient is φ = 2453710732.

The previous prime is 2565243059. The next prime is 2565243097. The reversal of 2565243061 is 1603425652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2565243061 - 2¹ = 2565243059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565243001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55766131 + ... + 55766176.

It is an arithmetic number, because the mean of its divisors is an integer number (669193848).

Almost surely, 2^2565243061 is an apocalyptic number.

It is an amenable number.

2565243061 is a deficient number, since it is larger than the sum of its proper divisors (111532331).

2565243061 is a wasteful number, since it uses less digits than its factorization.

2565243061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111532330.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 2565243061 is about 50648.2286067341. The cubic root of 2565243061 is about 1368.9140276004.

The spelling of 2565243061 in words is "two billion, five hundred sixty-five million, two hundred forty-three thousand, sixty-one".