266821099 has 2 divisors, whose sum is σ = 266821100. Its totient is φ = 266821098.

The previous prime is 266821067. The next prime is 266821109. The reversal of 266821099 is 990128662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266821099 - 2⁵ = 266821067 is a prime.

It is not a weakly prime, because it can be changed into another prime (266821019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133410549 + 133410550.

It is an arithmetic number, because the mean of its divisors is an integer number (133410550).

Almost surely, 2^266821099 is an apocalyptic number.

266821099 is a deficient number, since it is larger than the sum of its proper divisors (1).

266821099 is an equidigital number, since it uses as much as digits as its factorization.

266821099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 266821099 is about 16334.6594393639. The cubic root of 266821099 is about 643.7838180745.

The spelling of 266821099 in words is "two hundred sixty-six million, eight hundred twenty-one thousand, ninety-nine".