266147243 has 2 divisors, whose sum is σ = 266147244. Its totient is φ = 266147242.

The previous prime is 266147149. The next prime is 266147251. The reversal of 266147243 is 342741662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266147243 - 2⁸ = 266146987 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (266147143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133073621 + 133073622.

It is an arithmetic number, because the mean of its divisors is an integer number (133073622).

Almost surely, 2^266147243 is an apocalyptic number.

266147243 is a deficient number, since it is larger than the sum of its proper divisors (1).

266147243 is an equidigital number, since it uses as much as digits as its factorization.

266147243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 35.

The square root of 266147243 is about 16314.0198295822. The cubic root of 266147243 is about 643.2414030691.

The spelling of 266147243 in words is "two hundred sixty-six million, one hundred forty-seven thousand, two hundred forty-three".