2564380697 has 4 divisors (see below), whose sum is σ = 2568662400. Its totient is φ = 2560098996.

The previous prime is 2564380681. The next prime is 2564380703. The reversal of 2564380697 is 7960834652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2564380697 - 2⁴ = 2564380681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2564380397) 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, 2139953 + ... + 2141150.

It is an arithmetic number, because the mean of its divisors is an integer number (642165600).

Almost surely, 2^2564380697 is an apocalyptic number.

It is an amenable number.

2564380697 is a deficient number, since it is larger than the sum of its proper divisors (4281703).

2564380697 is an equidigital number, since it uses as much as digits as its factorization.

2564380697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4281702.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The square root of 2564380697 is about 50639.7146220237. The cubic root of 2564380697 is about 1368.7606133550.

The spelling of 2564380697 in words is "two billion, five hundred sixty-four million, three hundred eighty thousand, six hundred ninety-seven".