2564554565 has 4 divisors (see below), whose sum is σ = 3077465484. Its totient is φ = 2051643648.

The previous prime is 2564554547. The next prime is 2564554589. The reversal of 2564554565 is 5654554652.

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 1724076484 + 840478081 = 41522^2 + 28991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2564554565 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 256455452 + ... + 256455461.

It is an arithmetic number, because the mean of its divisors is an integer number (769366371).

Almost surely, 2^2564554565 is an apocalyptic number.

It is an amenable number.

2564554565 is a deficient number, since it is larger than the sum of its proper divisors (512910919).

2564554565 is an equidigital number, since it uses as much as digits as its factorization.

2564554565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512910918.

The product of its digits is 3600000, while the sum is 47.

The square root of 2564554565 is about 50641.4313087614. The cubic root of 2564554565 is about 1368.7915471775.

The spelling of 2564554565 in words is "two billion, five hundred sixty-four million, five hundred fifty-four thousand, five hundred sixty-five".