266979893 has 2 divisors, whose sum is σ = 266979894. Its totient is φ = 266979892.

The previous prime is 266979871. The next prime is 266979899. The reversal of 266979893 is 398979662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265592209 + 1387684 = 16297^2 + 1178^2 .

It is a cyclic number.

It is not a de Polignac number, because 266979893 - 2⁸ = 266979637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266979899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133489946 + 133489947.

It is an arithmetic number, because the mean of its divisors is an integer number (133489947).

Almost surely, 2^266979893 is an apocalyptic number.

It is an amenable number.

266979893 is a deficient number, since it is larger than the sum of its proper divisors (1).

266979893 is an equidigital number, since it uses as much as digits as its factorization.

266979893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8817984, while the sum is 59.

The square root of 266979893 is about 16339.5193625761. The cubic root of 266979893 is about 643.9115050462.

The spelling of 266979893 in words is "two hundred sixty-six million, nine hundred seventy-nine thousand, eight hundred ninety-three".