25205634497 has 2 divisors, whose sum is σ = 25205634498. Its totient is φ = 25205634496.

The previous prime is 25205634373. The next prime is 25205634529. The reversal of 25205634497 is 79443650252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19784110336 + 5421524161 = 140656^2 + 73631^2 .

It is a cyclic number.

It is not a de Polignac number, because 25205634497 - 2⁸ = 25205634241 is a prime.

It is not a weakly prime, because it can be changed into another prime (25205634697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12602817248 + 12602817249.

It is an arithmetic number, because the mean of its divisors is an integer number (12602817249).

Almost surely, 2^25205634497 is an apocalyptic number.

It is an amenable number.

25205634497 is a deficient number, since it is larger than the sum of its proper divisors (1).

25205634497 is an equidigital number, since it uses as much as digits as its factorization.

25205634497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 25205634497 in words is "twenty-five billion, two hundred five million, six hundred thirty-four thousand, four hundred ninety-seven".