25503504491 has 2 divisors, whose sum is σ = 25503504492. Its totient is φ = 25503504490.

The previous prime is 25503504451. The next prime is 25503504511. The reversal of 25503504491 is 19440530552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25503504491 is a prime.

It is not a weakly prime, because it can be changed into another prime (25503504451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12751752245 + 12751752246.

It is an arithmetic number, because the mean of its divisors is an integer number (12751752246).

Almost surely, 2^25503504491 is an apocalyptic number.

25503504491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25503504491 is an equidigital number, since it uses as much as digits as its factorization.

25503504491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 25503504491 in words is "twenty-five billion, five hundred three million, five hundred four thousand, four hundred ninety-one".