25581428347 has 2 divisors, whose sum is σ = 25581428348. Its totient is φ = 25581428346.

The previous prime is 25581428269. The next prime is 25581428441. The reversal of 25581428347 is 74382418552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25581428347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25581428347.

It is not a weakly prime, because it can be changed into another prime (25581428947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12790714173 + 12790714174.

It is an arithmetic number, because the mean of its divisors is an integer number (12790714174).

Almost surely, 2^25581428347 is an apocalyptic number.

25581428347 is a deficient number, since it is larger than the sum of its proper divisors (1).

25581428347 is an equidigital number, since it uses as much as digits as its factorization.

25581428347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2150400, while the sum is 49.

The spelling of 25581428347 in words is "twenty-five billion, five hundred eighty-one million, four hundred twenty-eight thousand, three hundred forty-seven".