2565309997 has 2 divisors, whose sum is σ = 2565309998. Its totient is φ = 2565309996.

The previous prime is 2565309959. The next prime is 2565310001. The reversal of 2565309997 is 7999035652.

It is a happy number.

2565309997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2565017316 + 292681 = 50646^2 + 541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565309997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2565309917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282654998 + 1282654999.

It is an arithmetic number, because the mean of its divisors is an integer number (1282654999).

Almost surely, 2^2565309997 is an apocalyptic number.

It is an amenable number.

2565309997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565309997 is an equidigital number, since it uses as much as digits as its factorization.

2565309997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4592700, while the sum is 55.

The square root of 2565309997 is about 50648.8893955238. The cubic root of 2565309997 is about 1368.9259340527.

The spelling of 2565309997 in words is "two billion, five hundred sixty-five million, three hundred nine thousand, nine hundred ninety-seven".