25664646247 has 2 divisors, whose sum is σ = 25664646248. Its totient is φ = 25664646246.

The previous prime is 25664646199. The next prime is 25664646257. The reversal of 25664646247 is 74264646652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25664646247 - 2¹⁵ = 25664613479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25664646194 and 25664646203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25664646257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12832323123 + 12832323124.

It is an arithmetic number, because the mean of its divisors is an integer number (12832323124).

Almost surely, 2^25664646247 is an apocalyptic number.

25664646247 is a deficient number, since it is larger than the sum of its proper divisors (1).

25664646247 is an equidigital number, since it uses as much as digits as its factorization.

25664646247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11612160, while the sum is 52.

The spelling of 25664646247 in words is "twenty-five billion, six hundred sixty-four million, six hundred forty-six thousand, two hundred forty-seven".