1266876563 has 2 divisors, whose sum is σ = 1266876564. Its totient is φ = 1266876562.

The previous prime is 1266876553. The next prime is 1266876581. The reversal of 1266876563 is 3656786621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1266876563 - 2⁸ = 1266876307 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266876553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633438281 + 633438282.

It is an arithmetic number, because the mean of its divisors is an integer number (633438282).

Almost surely, 2^1266876563 is an apocalyptic number.

1266876563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266876563 is an equidigital number, since it uses as much as digits as its factorization.

1266876563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 50.

The square root of 1266876563 is about 35593.2095068708. The cubic root of 1266876563 is about 1082.0436165497.

The spelling of 1266876563 in words is "one billion, two hundred sixty-six million, eight hundred seventy-six thousand, five hundred sixty-three".