25540803647 has 2 divisors, whose sum is σ = 25540803648. Its totient is φ = 25540803646.

The previous prime is 25540803641. The next prime is 25540803737. The reversal of 25540803647 is 74630804552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25540803647 - 2¹⁴ = 25540787263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25540803598 and 25540803607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25540803641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12770401823 + 12770401824.

It is an arithmetic number, because the mean of its divisors is an integer number (12770401824).

Almost surely, 2^25540803647 is an apocalyptic number.

25540803647 is a deficient number, since it is larger than the sum of its proper divisors (1).

25540803647 is an equidigital number, since it uses as much as digits as its factorization.

25540803647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 25540803647 in words is "twenty-five billion, five hundred forty million, eight hundred three thousand, six hundred forty-seven".