2563544561 has 4 divisors (see below), whose sum is σ = 2564156400. Its totient is φ = 2562932724.

The previous prime is 2563544539. The next prime is 2563544567. The reversal of 2563544561 is 1654453652.

It is a happy number.

2563544561 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, 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 2563544561 - 2⁶ = 2563544497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2563544567) 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, 299591 + ... + 308028.

It is an arithmetic number, because the mean of its divisors is an integer number (641039100).

Almost surely, 2^2563544561 is an apocalyptic number.

It is an amenable number.

2563544561 is a deficient number, since it is larger than the sum of its proper divisors (611839).

2563544561 is an equidigital number, since it uses as much as digits as its factorization.

2563544561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611838.

The product of its digits is 432000, while the sum is 41.

The square root of 2563544561 is about 50631.4582152243. The cubic root of 2563544561 is about 1368.6118322171.

Subtracting from 2563544561 its reverse (1654453652), we obtain a palindrome (909090909).

The spelling of 2563544561 in words is "two billion, five hundred sixty-three million, five hundred forty-four thousand, five hundred sixty-one".