1266759617 has 2 divisors, whose sum is σ = 1266759618. Its totient is φ = 1266759616.

The previous prime is 1266759581. The next prime is 1266759623. The reversal of 1266759617 is 7169576621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1244396176 + 22363441 = 35276^2 + 4729^2 .

It is an emirp because it is prime and its reverse (7169576621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266759617 - 2¹⁰ = 1266758593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266759667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633379808 + 633379809.

It is an arithmetic number, because the mean of its divisors is an integer number (633379809).

Almost surely, 2^1266759617 is an apocalyptic number.

It is an amenable number.

1266759617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266759617 is an equidigital number, since it uses as much as digits as its factorization.

1266759617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 50.

The square root of 1266759617 is about 35591.5666555998. The cubic root of 1266759617 is about 1082.0103208653.

The spelling of 1266759617 in words is "one billion, two hundred sixty-six million, seven hundred fifty-nine thousand, six hundred seventeen".