2564697655 has 8 divisors (see below), whose sum is σ = 3314378592. Its totient is φ = 1893930528.

The previous prime is 2564697649. The next prime is 2564697683. The reversal of 2564697655 is 5567964652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2564697655 - 2³ = 2564697647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2564697596 and 2564697605.

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, 19728379 + ... + 19728508.

It is an arithmetic number, because the mean of its divisors is an integer number (414297324).

Almost surely, 2^2564697655 is an apocalyptic number.

2564697655 is a deficient number, since it is larger than the sum of its proper divisors (749680937).

2564697655 is a wasteful number, since it uses less digits than its factorization.

2564697655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39456905.

The product of its digits is 13608000, while the sum is 55.

The square root of 2564697655 is about 50642.8440650799. The cubic root of 2564697655 is about 1368.8170040662.

The spelling of 2564697655 in words is "two billion, five hundred sixty-four million, six hundred ninety-seven thousand, six hundred fifty-five".