2565474761 has 2 divisors, whose sum is σ = 2565474762. Its totient is φ = 2565474760.

The previous prime is 2565474713. The next prime is 2565474817. The reversal of 2565474761 is 1674745652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1589537161 + 975937600 = 39869^2 + 31240^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565474761 - 2²⁶ = 2498365897 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2565471761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282737380 + 1282737381.

It is an arithmetic number, because the mean of its divisors is an integer number (1282737381).

Almost surely, 2^2565474761 is an apocalyptic number.

It is an amenable number.

2565474761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565474761 is an equidigital number, since it uses as much as digits as its factorization.

2565474761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1411200, while the sum is 47.

The square root of 2565474761 is about 50650.5159006303. The cubic root of 2565474761 is about 1368.9552410870.

The spelling of 2565474761 in words is "two billion, five hundred sixty-five million, four hundred seventy-four thousand, seven hundred sixty-one".