25041440561 has 2 divisors, whose sum is σ = 25041440562. Its totient is φ = 25041440560.

The previous prime is 25041440539. The next prime is 25041440573. The reversal of 25041440561 is 16504414052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24954204961 + 87235600 = 157969^2 + 9340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25041440561 is a prime.

It is not a weakly prime, because it can be changed into another prime (25041440581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12520720280 + 12520720281.

It is an arithmetic number, because the mean of its divisors is an integer number (12520720281).

Almost surely, 2^25041440561 is an apocalyptic number.

It is an amenable number.

25041440561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25041440561 is an equidigital number, since it uses as much as digits as its factorization.

25041440561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 32.

The spelling of 25041440561 in words is "twenty-five billion, forty-one million, four hundred forty thousand, five hundred sixty-one".