266945869 has 2 divisors, whose sum is σ = 266945870. Its totient is φ = 266945868.

The previous prime is 266945857. The next prime is 266945879. The reversal of 266945869 is 968549662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266930244 + 15625 = 16338^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 266945869 - 2⁷ = 266945741 is a prime.

It is a super-2 number, since 2×266945869² = 142520193952330322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266945879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133472934 + 133472935.

It is an arithmetic number, because the mean of its divisors is an integer number (133472935).

Almost surely, 2^266945869 is an apocalyptic number.

It is an amenable number.

266945869 is a deficient number, since it is larger than the sum of its proper divisors (1).

266945869 is an equidigital number, since it uses as much as digits as its factorization.

266945869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 55.

The square root of 266945869 is about 16338.4781727063. The cubic root of 266945869 is about 643.8841504571.

The spelling of 266945869 in words is "two hundred sixty-six million, nine hundred forty-five thousand, eight hundred sixty-nine".