266980891 has 2 divisors, whose sum is σ = 266980892. Its totient is φ = 266980890.

The previous prime is 266980867. The next prime is 266980907. The reversal of 266980891 is 198089662.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266980891 - 2⁵ = 266980859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (266980691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133490445 + 133490446.

It is an arithmetic number, because the mean of its divisors is an integer number (133490446).

Almost surely, 2^266980891 is an apocalyptic number.

266980891 is a deficient number, since it is larger than the sum of its proper divisors (1).

266980891 is an equidigital number, since it uses as much as digits as its factorization.

266980891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 266980891 is about 16339.5499020016. The cubic root of 266980891 is about 643.9123073824.

The spelling of 266980891 in words is "two hundred sixty-six million, nine hundred eighty thousand, eight hundred ninety-one".