266665783 has 2 divisors, whose sum is σ = 266665784. Its totient is φ = 266665782.

The previous prime is 266665727. The next prime is 266665793. The reversal of 266665783 is 387566662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266665783 - 2¹⁷ = 266534711 is a prime.

It is a super-2 number, since 2×266665783² = 142221279646006178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266665793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133332891 + 133332892.

It is an arithmetic number, because the mean of its divisors is an integer number (133332892).

Almost surely, 2^266665783 is an apocalyptic number.

266665783 is a deficient number, since it is larger than the sum of its proper divisors (1).

266665783 is an equidigital number, since it uses as much as digits as its factorization.

266665783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 49.

The square root of 266665783 is about 16329.9045618767. The cubic root of 266665783 is about 643.6588787606.

The spelling of 266665783 in words is "two hundred sixty-six million, six hundred sixty-five thousand, seven hundred eighty-three".