2561641453 has 6 divisors (see below), whose sum is σ = 2979868686. Its totient is φ = 2195692632.

The previous prime is 2561641441. The next prime is 2561641457. The reversal of 2561641453 is 3541461652.

It can be written as a sum of positive squares in only one way, i.e., 1533348964 + 1028292489 = 39158^2 + 32067^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2561641453 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 (2561641457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26139150 + ... + 26139247.

It is an arithmetic number, because the mean of its divisors is an integer number (496644781).

Almost surely, 2^2561641453 is an apocalyptic number.

It is an amenable number.

2561641453 is a deficient number, since it is larger than the sum of its proper divisors (418227233).

2561641453 is an equidigital number, since it uses as much as digits as its factorization.

2561641453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52278411 (or 52278404 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 2561641453 is about 50612.6609950514. The cubic root of 2561641453 is about 1368.2730745759.

The spelling of 2561641453 in words is "two billion, five hundred sixty-one million, six hundred forty-one thousand, four hundred fifty-three".