25810518647 has 2 divisors, whose sum is σ = 25810518648. Its totient is φ = 25810518646.

The previous prime is 25810518521. The next prime is 25810518653. The reversal of 25810518647 is 74681501852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25810518647 - 2²⁴ = 25793741431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25810518347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12905259323 + 12905259324.

It is an arithmetic number, because the mean of its divisors is an integer number (12905259324).

Almost surely, 2^25810518647 is an apocalyptic number.

25810518647 is a deficient number, since it is larger than the sum of its proper divisors (1).

25810518647 is an equidigital number, since it uses as much as digits as its factorization.

25810518647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 25810518647 in words is "twenty-five billion, eight hundred ten million, five hundred eighteen thousand, six hundred forty-seven".