2565661297 has 2 divisors, whose sum is σ = 2565661298. Its totient is φ = 2565661296.

The previous prime is 2565661283. The next prime is 2565661337. The reversal of 2565661297 is 7921665652.

2565661297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1653560896 + 912100401 = 40664^2 + 30201^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565661297 - 2¹⁵ = 2565628529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2565661297.

It is not a weakly prime, because it can be changed into another prime (2565661207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282830648 + 1282830649.

It is an arithmetic number, because the mean of its divisors is an integer number (1282830649).

Almost surely, 2^2565661297 is an apocalyptic number.

It is an amenable number.

2565661297 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565661297 is an equidigital number, since it uses as much as digits as its factorization.

2565661297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 49.

The square root of 2565661297 is about 50652.3572699238. The cubic root of 2565661297 is about 1368.9884192534.

The spelling of 2565661297 in words is "two billion, five hundred sixty-five million, six hundred sixty-one thousand, two hundred ninety-seven".