8426666249 has 2 divisors, whose sum is σ = 8426666250. Its totient is φ = 8426666248.

The previous prime is 8426666203. The next prime is 8426666263. The reversal of 8426666249 is 9426666248.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6573966400 + 1852699849 = 81080^2 + 43043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8426666249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8426666249.

It is not a weakly prime, because it can be changed into another prime (8426666279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4213333124 + 4213333125.

It is an arithmetic number, because the mean of its divisors is an integer number (4213333125).

Almost surely, 2^8426666249 is an apocalyptic number.

It is an amenable number.

8426666249 is a deficient number, since it is larger than the sum of its proper divisors (1).

8426666249 is an equidigital number, since it uses as much as digits as its factorization.

8426666249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 53.

The square root of 8426666249 is about 91796.8749413617. The cubic root of 8426666249 is about 2034.9415111161.

Subtracting 8426666249 from its reverse (9426666248), we obtain a palindrome (999999999).

The spelling of 8426666249 in words is "eight billion, four hundred twenty-six million, six hundred sixty-six thousand, two hundred forty-nine".