2564368261 has 16 divisors (see below), whose sum is σ = 3158483328. Its totient is φ = 2027448000.

The previous prime is 2564368243. The next prime is 2564368283. The reversal of 2564368261 is 1628634652.

It is a cyclic number.

It is not a de Polignac number, because 2564368261 - 2¹¹ = 2564366213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564368201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122331 + ... + 141751.

It is an arithmetic number, because the mean of its divisors is an integer number (197405208).

Almost surely, 2^2564368261 is an apocalyptic number.

It is an amenable number.

2564368261 is a deficient number, since it is larger than the sum of its proper divisors (594115067).

2564368261 is a wasteful number, since it uses less digits than its factorization.

2564368261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20892.

The product of its digits is 414720, while the sum is 43.

The square root of 2564368261 is about 50639.5918328732. The cubic root of 2564368261 is about 1368.7584007435.

The spelling of 2564368261 in words is "two billion, five hundred sixty-four million, three hundred sixty-eight thousand, two hundred sixty-one".