2564343385 has 4 divisors (see below), whose sum is σ = 3077212068. Its totient is φ = 2051474704.

The previous prime is 2564343377. The next prime is 2564343403. The reversal of 2564343385 is 5833434652.

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 1900611216 + 663732169 = 43596^2 + 25763^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564343385 - 2³ = 2564343377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256434334 + ... + 256434343.

It is an arithmetic number, because the mean of its divisors is an integer number (769303017).

Almost surely, 2^2564343385 is an apocalyptic number.

It is an amenable number.

2564343385 is a deficient number, since it is larger than the sum of its proper divisors (512868683).

2564343385 is an equidigital number, since it uses as much as digits as its factorization.

2564343385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512868682.

The product of its digits is 1036800, while the sum is 43.

The square root of 2564343385 is about 50639.3462141841. The cubic root of 2564343385 is about 1368.7539747874.

The spelling of 2564343385 in words is "two billion, five hundred sixty-four million, three hundred forty-three thousand, three hundred eighty-five".