266881969 has 2 divisors, whose sum is σ = 266881970. Its totient is φ = 266881968.

The previous prime is 266881943. The next prime is 266881973. The reversal of 266881969 is 969188662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180633600 + 86248369 = 13440^2 + 9287^2 .

It is a cyclic number.

It is not a de Polignac number, because 266881969 - 2¹⁵ = 266849201 is a prime.

It is a super-2 number, since 2×266881969² = 142451970754633922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266881919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133440984 + 133440985.

It is an arithmetic number, because the mean of its divisors is an integer number (133440985).

Almost surely, 2^266881969 is an apocalyptic number.

It is an amenable number.

266881969 is a deficient number, since it is larger than the sum of its proper divisors (1).

266881969 is an equidigital number, since it uses as much as digits as its factorization.

266881969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 55.

The square root of 266881969 is about 16336.5225491841. The cubic root of 266881969 is about 643.8327699023.

The spelling of 266881969 in words is "two hundred sixty-six million, eight hundred eighty-one thousand, nine hundred sixty-nine".