1266820847 has 2 divisors, whose sum is σ = 1266820848. Its totient is φ = 1266820846.

The previous prime is 1266820843. The next prime is 1266820871. The reversal of 1266820847 is 7480286621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1266820847 - 2² = 1266820843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266820798 and 1266820807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266820843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633410423 + 633410424.

It is an arithmetic number, because the mean of its divisors is an integer number (633410424).

Almost surely, 2^1266820847 is an apocalyptic number.

1266820847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266820847 is an equidigital number, since it uses as much as digits as its factorization.

1266820847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 1266820847 is about 35592.4268208842. The cubic root of 1266820847 is about 1082.0277539083.

The spelling of 1266820847 in words is "one billion, two hundred sixty-six million, eight hundred twenty thousand, eight hundred forty-seven".