25491452647 has 2 divisors, whose sum is σ = 25491452648. Its totient is φ = 25491452646.

The previous prime is 25491452641. The next prime is 25491452699. The reversal of 25491452647 is 74625419452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25491452647 - 2¹¹ = 25491450599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25491452647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25491452641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12745726323 + 12745726324.

It is an arithmetic number, because the mean of its divisors is an integer number (12745726324).

Almost surely, 2^25491452647 is an apocalyptic number.

25491452647 is a deficient number, since it is larger than the sum of its proper divisors (1).

25491452647 is an equidigital number, since it uses as much as digits as its factorization.

25491452647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 49.

The spelling of 25491452647 in words is "twenty-five billion, four hundred ninety-one million, four hundred fifty-two thousand, six hundred forty-seven".