266991799 has 2 divisors, whose sum is σ = 266991800. Its totient is φ = 266991798.

The previous prime is 266991779. The next prime is 266991841. The reversal of 266991799 is 997199662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266991799 - 2¹⁵ = 266959031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266991709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133495899 + 133495900.

It is an arithmetic number, because the mean of its divisors is an integer number (133495900).

Almost surely, 2^266991799 is an apocalyptic number.

266991799 is a deficient number, since it is larger than the sum of its proper divisors (1).

266991799 is an equidigital number, since it uses as much as digits as its factorization.

266991799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3306744, while the sum is 58.

The square root of 266991799 is about 16339.8836899165. The cubic root of 266991799 is about 643.9210766739.

The spelling of 266991799 in words is "two hundred sixty-six million, nine hundred ninety-one thousand, seven hundred ninety-nine".