1266820843 has 2 divisors, whose sum is σ = 1266820844. Its totient is φ = 1266820842.

The previous prime is 1266820823. The next prime is 1266820847. The reversal of 1266820843 is 3480286621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266820843 - 2²⁹ = 729949931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266820796 and 1266820805.

It is not a weakly prime, because it can be changed into another prime (1266820847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633410421 + 633410422.

It is an arithmetic number, because the mean of its divisors is an integer number (633410422).

Almost surely, 2^1266820843 is an apocalyptic number.

1266820843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266820843 is an equidigital number, since it uses as much as digits as its factorization.

1266820843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 1266820843 is about 35592.4267646925. The cubic root of 1266820843 is about 1082.0277527695.

The spelling of 1266820843 in words is "one billion, two hundred sixty-six million, eight hundred twenty thousand, eight hundred forty-three".