1266356849 has 2 divisors, whose sum is σ = 1266356850. Its totient is φ = 1266356848.

The previous prime is 1266356803. The next prime is 1266356863. The reversal of 1266356849 is 9486536621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1263091600 + 3265249 = 35540^2 + 1807^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266356849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266356797 and 1266356806.

It is not a weakly prime, because it can be changed into another prime (1266356899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633178424 + 633178425.

It is an arithmetic number, because the mean of its divisors is an integer number (633178425).

Almost surely, 2^1266356849 is an apocalyptic number.

It is an amenable number.

1266356849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266356849 is an equidigital number, since it uses as much as digits as its factorization.

1266356849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 50.

The square root of 1266356849 is about 35585.9080114587. The cubic root of 1266356849 is about 1081.8956331422.

The spelling of 1266356849 in words is "one billion, two hundred sixty-six million, three hundred fifty-six thousand, eight hundred forty-nine".