1266995911 has 2 divisors, whose sum is σ = 1266995912. Its totient is φ = 1266995910.

The previous prime is 1266995887. The next prime is 1266995927. The reversal of 1266995911 is 1195996621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266995911 - 2⁵ = 1266995879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266990911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633497955 + 633497956.

It is an arithmetic number, because the mean of its divisors is an integer number (633497956).

Almost surely, 2^1266995911 is an apocalyptic number.

1266995911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266995911 is an equidigital number, since it uses as much as digits as its factorization.

1266995911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 49.

The square root of 1266995911 is about 35594.8860231354. The cubic root of 1266995911 is about 1082.0775939948.

The spelling of 1266995911 in words is "one billion, two hundred sixty-six million, nine hundred ninety-five thousand, nine hundred eleven".