1266208897 has 2 divisors, whose sum is σ = 1266208898. Its totient is φ = 1266208896.

The previous prime is 1266208873. The next prime is 1266208969. The reversal of 1266208897 is 7988026621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1250400321 + 15808576 = 35361^2 + 3976^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266208897 - 2¹⁵ = 1266176129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1266208897.

It is not a weakly prime, because it can be changed into another prime (1266208597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633104448 + 633104449.

It is an arithmetic number, because the mean of its divisors is an integer number (633104449).

Almost surely, 2^1266208897 is an apocalyptic number.

It is an amenable number.

1266208897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266208897 is an equidigital number, since it uses as much as digits as its factorization.

1266208897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 1266208897 is about 35583.8291503318. The cubic root of 1266208897 is about 1081.8534978739.

The spelling of 1266208897 in words is "one billion, two hundred sixty-six million, two hundred eight thousand, eight hundred ninety-seven".