1266383828891 has 4 divisors (see below), whose sum is σ = 1266417689784. Its totient is φ = 1266349968000.

The previous prime is 1266383828881. The next prime is 1266383828921. The reversal of 1266383828891 is 1988283836621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1266383828891 - 2²² = 1266379634587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266383828861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16874285 + ... + 16949166.

It is an arithmetic number, because the mean of its divisors is an integer number (316604422446).

Almost surely, 2^{1266383828891} is an apocalyptic number.

1266383828891 is a deficient number, since it is larger than the sum of its proper divisors (33860893).

1266383828891 is an equidigital number, since it uses as much as digits as its factorization.

1266383828891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33860892.

The product of its digits is 47775744, while the sum is 65.

The spelling of 1266383828891 in words is "one trillion, two hundred sixty-six billion, three hundred eighty-three million, eight hundred twenty-eight thousand, eight hundred ninety-one".