266660289 has 32 divisors (see below), whose sum is σ = 453185280. Its totient is φ = 151804800.

The previous prime is 266660279. The next prime is 266660291. The reversal of 266660289 is 982066662.

It is not a de Polignac number, because 266660289 - 2⁷ = 266660161 is a prime.

It is a super-2 number, since 2×266660289² = 142215419459127042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266660279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50599 + ... + 55619.

It is an arithmetic number, because the mean of its divisors is an integer number (14162040).

Almost surely, 2^266660289 is an apocalyptic number.

It is an amenable number.

266660289 is a deficient number, since it is larger than the sum of its proper divisors (186524991).

266660289 is a wasteful number, since it uses less digits than its factorization.

266660289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318 (or 5312 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 266660289 is about 16329.7363420234. The cubic root of 266660289 is about 643.6544583883.

The spelling of 266660289 in words is "two hundred sixty-six million, six hundred sixty thousand, two hundred eighty-nine".