266856489 has 12 divisors (see below), whose sum is σ = 386778756. Its totient is φ = 177295392.

The previous prime is 266856487. The next prime is 266856493. The reversal of 266856489 is 984658662.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 246741264 + 20115225 = 15708^2 + 4485^2 .

It is not a de Polignac number, because 266856489 - 2¹ = 266856487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (266856487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47962 + ... + 53235.

It is an arithmetic number, because the mean of its divisors is an integer number (32231563).

Almost surely, 2^266856489 is an apocalyptic number.

It is an amenable number.

266856489 is a deficient number, since it is larger than the sum of its proper divisors (119922267).

266856489 is a wasteful number, since it uses less digits than its factorization.

266856489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101496 (or 101493 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 266856489 is about 16335.7426828412. The cubic root of 266856489 is about 643.8122797193.

The spelling of 266856489 in words is "two hundred sixty-six million, eight hundred fifty-six thousand, four hundred eighty-nine".