1266076813 has 4 divisors (see below), whose sum is σ = 1266983200. Its totient is φ = 1265170428.

The previous prime is 1266076807. The next prime is 1266076939. The reversal of 1266076813 is 3186706621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1266076813 - 2¹⁷ = 1265945741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266076213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451095 + ... + 453892.

It is an arithmetic number, because the mean of its divisors is an integer number (316745800).

Almost surely, 2^1266076813 is an apocalyptic number.

It is an amenable number.

1266076813 is a deficient number, since it is larger than the sum of its proper divisors (906387).

1266076813 is an equidigital number, since it uses as much as digits as its factorization.

1266076813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906386.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1266076813 is about 35581.9731465246. The cubic root of 1266076813 is about 1081.8158788821.

The spelling of 1266076813 in words is "one billion, two hundred sixty-six million, seventy-six thousand, eight hundred thirteen".