266287866 has 32 divisors (see below), whose sum is σ = 587539008. Its totient is φ = 79935360.

The previous prime is 266287849. The next prime is 266287871. The reversal of 266287866 is 668782662.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38436 + ... + 44831.

It is an arithmetic number, because the mean of its divisors is an integer number (18360594).

Almost surely, 2^266287866 is an apocalyptic number.

266287866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

266287866 is an abundant number, since it is smaller than the sum of its proper divisors (321251142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266287866 is a wasteful number, since it uses less digits than its factorization.

266287866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83326.

The product of its digits is 2322432, while the sum is 51.

The square root of 266287866 is about 16318.3291424092. The cubic root of 266287866 is about 643.3546719605.

The spelling of 266287866 in words is "two hundred sixty-six million, two hundred eighty-seven thousand, eight hundred sixty-six".