2564636771 has 2 divisors, whose sum is σ = 2564636772. Its totient is φ = 2564636770.

The previous prime is 2564636761. The next prime is 2564636773. The reversal of 2564636771 is 1776364652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2564636771 is a prime.

Together with 2564636773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2564636773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282318385 + 1282318386.

It is an arithmetic number, because the mean of its divisors is an integer number (1282318386).

Almost surely, 2^2564636771 is an apocalyptic number.

2564636771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2564636771 is an equidigital number, since it uses as much as digits as its factorization.

2564636771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 47.

The square root of 2564636771 is about 50642.2429499326. The cubic root of 2564636771 is about 1368.8061724172.

The spelling of 2564636771 in words is "two billion, five hundred sixty-four million, six hundred thirty-six thousand, seven hundred seventy-one".