2564697656 has 32 divisors (see below), whose sum is σ = 5094414000. Its totient is φ = 1206268416.

The previous prime is 2564697649. The next prime is 2564697683. The reversal of 2564697656 is 6567964652.

2564697656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330590 + ... + 338258.

Almost surely, 2^2564697656 is an apocalyptic number.

It is an amenable number.

2564697656 is a deficient number, since it is larger than the sum of its proper divisors (2529716344).

2564697656 is a wasteful number, since it uses less digits than its factorization.

2564697656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10151 (or 10147 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 56.

The square root of 2564697656 is about 50642.8440749530. The cubic root of 2564697656 is about 1368.8170042441.

The spelling of 2564697656 in words is "two billion, five hundred sixty-four million, six hundred ninety-seven thousand, six hundred fifty-six".