25785861047 has 2 divisors, whose sum is σ = 25785861048. Its totient is φ = 25785861046.

The previous prime is 25785861019. The next prime is 25785861053. The reversal of 25785861047 is 74016858752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25785861047 - 2²⁴ = 25769083831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25785861047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25785861007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12892930523 + 12892930524.

It is an arithmetic number, because the mean of its divisors is an integer number (12892930524).

Almost surely, 2^25785861047 is an apocalyptic number.

25785861047 is a deficient number, since it is larger than the sum of its proper divisors (1).

25785861047 is an equidigital number, since it uses as much as digits as its factorization.

25785861047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 25785861047 in words is "twenty-five billion, seven hundred eighty-five million, eight hundred sixty-one thousand, forty-seven".