25609705547 has 2 divisors, whose sum is σ = 25609705548. Its totient is φ = 25609705546.

The previous prime is 25609705519. The next prime is 25609705651. The reversal of 25609705547 is 74550790652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25609705547 - 2⁸ = 25609705291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25609705495 and 25609705504.

It is not a weakly prime, because it can be changed into another prime (25609765547) 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, 12804852773 + 12804852774.

It is an arithmetic number, because the mean of its divisors is an integer number (12804852774).

Almost surely, 2^25609705547 is an apocalyptic number.

25609705547 is a deficient number, since it is larger than the sum of its proper divisors (1).

25609705547 is an equidigital number, since it uses as much as digits as its factorization.

25609705547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646000, while the sum is 50.

The spelling of 25609705547 in words is "twenty-five billion, six hundred nine million, seven hundred five thousand, five hundred forty-seven".