2560636621 has 4 divisors (see below), whose sum is σ = 2671968672. Its totient is φ = 2449304572.

The previous prime is 2560636607. The next prime is 2560636697. The reversal of 2560636621 is 1266360652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2560636621 - 2⁷ = 2560636493 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 (2560636021) 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, 55665991 + ... + 55666036.

It is an arithmetic number, because the mean of its divisors is an integer number (667992168).

Almost surely, 2^2560636621 is an apocalyptic number.

It is an amenable number.

2560636621 is a deficient number, since it is larger than the sum of its proper divisors (111332051).

2560636621 is a wasteful number, since it uses less digits than its factorization.

2560636621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111332050.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 2560636621 is about 50602.7333352656. The cubic root of 2560636621 is about 1368.0941444634.

The spelling of 2560636621 in words is "two billion, five hundred sixty million, six hundred thirty-six thousand, six hundred twenty-one".