25645340447 has 2 divisors, whose sum is σ = 25645340448. Its totient is φ = 25645340446.

The previous prime is 25645340443. The next prime is 25645340473. The reversal of 25645340447 is 74404354652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25645340447 - 2² = 25645340443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25645340398 and 25645340407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25645340443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822670223 + 12822670224.

It is an arithmetic number, because the mean of its divisors is an integer number (12822670224).

Almost surely, 2^25645340447 is an apocalyptic number.

25645340447 is a deficient number, since it is larger than the sum of its proper divisors (1).

25645340447 is an equidigital number, since it uses as much as digits as its factorization.

25645340447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1612800, while the sum is 44.

The spelling of 25645340447 in words is "twenty-five billion, six hundred forty-five million, three hundred forty thousand, four hundred forty-seven".