25666111243 has 2 divisors, whose sum is σ = 25666111244. Its totient is φ = 25666111242.

The previous prime is 25666111241. The next prime is 25666111277. The reversal of 25666111243 is 34211166652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25666111243 - 2¹ = 25666111241 is a prime.

Together with 25666111241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25666111241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833055621 + 12833055622.

It is an arithmetic number, because the mean of its divisors is an integer number (12833055622).

Almost surely, 2^25666111243 is an apocalyptic number.

25666111243 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666111243 is an equidigital number, since it uses as much as digits as its factorization.

25666111243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

Adding to 25666111243 its reverse (34211166652), we get a palindrome (59877277895).

The spelling of 25666111243 in words is "twenty-five billion, six hundred sixty-six million, one hundred eleven thousand, two hundred forty-three".