2564697613 has 4 divisors (see below), whose sum is σ = 2613088188. Its totient is φ = 2516307040.

The previous prime is 2564697599. The next prime is 2564697647. The reversal of 2564697613 is 3167964652.

It is a happy number.

2564697613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2343818569 + 220879044 = 48413^2 + 14862^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564697613 - 2⁵ = 2564697581 is a prime.

It is a super-2 number, since 2×2564697613² = 13155347692255795538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564697683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24195208 + ... + 24195313.

It is an arithmetic number, because the mean of its divisors is an integer number (653272047).

Almost surely, 2^2564697613 is an apocalyptic number.

It is an amenable number.

2564697613 is a deficient number, since it is larger than the sum of its proper divisors (48390575).

2564697613 is an equidigital number, since it uses as much as digits as its factorization.

2564697613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48390574.

The product of its digits is 1632960, while the sum is 49.

The square root of 2564697613 is about 50642.8436504113. The cubic root of 2564697613 is about 1368.8169965942.

The spelling of 2564697613 in words is "two billion, five hundred sixty-four million, six hundred ninety-seven thousand, six hundred thirteen".