2564641265 has 8 divisors (see below), whose sum is σ = 3090340968. Its totient is φ = 2043198720.

The previous prime is 2564641249. The next prime is 2564641279. The reversal of 2564641265 is 5621464652.

It can be written as a sum of positive squares in 4 ways, for example, as 174213601 + 2390427664 = 13199^2 + 48892^2 .

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

It is not a de Polignac number, because 2564641265 - 2⁴ = 2564641249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1062962 + ... + 1065371.

It is an arithmetic number, because the mean of its divisors is an integer number (386292621).

Almost surely, 2^2564641265 is an apocalyptic number.

It is an amenable number.

2564641265 is a deficient number, since it is larger than the sum of its proper divisors (525699703).

2564641265 is a wasteful number, since it uses less digits than its factorization.

2564641265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128579.

The product of its digits is 345600, while the sum is 41.

The square root of 2564641265 is about 50642.2873199859. The cubic root of 2564641265 is about 1368.8069719341.

The spelling of 2564641265 in words is "two billion, five hundred sixty-four million, six hundred forty-one thousand, two hundred sixty-five".