266255989 has 12 divisors (see below), whose sum is σ = 292601700. Its totient is φ = 241945088.

The previous prime is 266255971. The next prime is 266255999. The reversal of 266255989 is 989552662.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 8910225 + 257345764 = 2985^2 + 16042^2 .

It is not a de Polignac number, because 266255989 - 2¹³ = 266247797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266255999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7504 + ... + 24265.

It is an arithmetic number, because the mean of its divisors is an integer number (24383475).

Almost surely, 2^266255989 is an apocalyptic number.

266255989 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

266255989 is a deficient number, since it is larger than the sum of its proper divisors (26345711).

266255989 is a wasteful number, since it uses less digits than its factorization.

266255989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31832 (or 31815 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 52.

The square root of 266255989 is about 16317.3523894044. The cubic root of 266255989 is about 643.3289991982.

The spelling of 266255989 in words is "two hundred sixty-six million, two hundred fifty-five thousand, nine hundred eighty-nine".