2564368621 has 4 divisors (see below), whose sum is σ = 2715213852. Its totient is φ = 2413523392.

The previous prime is 2564368591. The next prime is 2564368637. The reversal of 2564368621 is 1268634652.

2564368621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1865030596 + 699338025 = 43186^2 + 26445^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564368621 - 2²⁵ = 2530814189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564368021) 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, 75422590 + ... + 75422623.

It is an arithmetic number, because the mean of its divisors is an integer number (678803463).

Almost surely, 2^2564368621 is an apocalyptic number.

It is an amenable number.

2564368621 is a deficient number, since it is larger than the sum of its proper divisors (150845231).

2564368621 is a wasteful number, since it uses less digits than its factorization.

2564368621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150845230.

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

The square root of 2564368621 is about 50639.5953874041. The cubic root of 2564368621 is about 1368.7584647948.

The spelling of 2564368621 in words is "two billion, five hundred sixty-four million, three hundred sixty-eight thousand, six hundred twenty-one".