25211045491 has 2 divisors, whose sum is σ = 25211045492. Its totient is φ = 25211045490.

The previous prime is 25211045477. The next prime is 25211045507. The reversal of 25211045491 is 19454011252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25211045491 - 2⁹ = 25211044979 is a prime.

It is not a weakly prime, because it can be changed into another prime (25211046491) 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 as a sum of consecutive naturals, namely, 12605522745 + 12605522746.

It is an arithmetic number, because the mean of its divisors is an integer number (12605522746).

Almost surely, 2^25211045491 is an apocalyptic number.

25211045491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25211045491 is an equidigital number, since it uses as much as digits as its factorization.

25211045491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 25211045491 in words is "twenty-five billion, two hundred eleven million, forty-five thousand, four hundred ninety-one".