1266804401 has 2 divisors, whose sum is σ = 1266804402. Its totient is φ = 1266804400.

The previous prime is 1266804397. The next prime is 1266804403. The reversal of 1266804401 is 1044086621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 892575376 + 374229025 = 29876^2 + 19345^2 .

It is an emirp because it is prime and its reverse (1044086621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266804401 - 2² = 1266804397 is a prime.

Together with 1266804403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1266804403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633402200 + 633402201.

It is an arithmetic number, because the mean of its divisors is an integer number (633402201).

Almost surely, 2^1266804401 is an apocalyptic number.

It is an amenable number.

1266804401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266804401 is an equidigital number, since it uses as much as digits as its factorization.

1266804401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1266804401 is about 35592.1957878409. The cubic root of 1266804401 is about 1082.0230715558.

The spelling of 1266804401 in words is "one billion, two hundred sixty-six million, eight hundred four thousand, four hundred one".