266881066 has 4 divisors (see below), whose sum is σ = 400321602. Its totient is φ = 133440532.

The previous prime is 266881063. The next prime is 266881073. The reversal of 266881066 is 660188662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 266832225 + 48841 = 16335^2 + 221^2 .

It is not an unprimeable number, because it can be changed into a prime (266881063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66720265 + ... + 66720268.

Almost surely, 2^266881066 is an apocalyptic number.

266881066 is a deficient number, since it is larger than the sum of its proper divisors (133440536).

266881066 is a wasteful number, since it uses less digits than its factorization.

266881066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133440535.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 266881066 is about 16336.4949117000. The cubic root of 266881066 is about 643.8320437615.

The spelling of 266881066 in words is "two hundred sixty-six million, eight hundred eighty-one thousand, sixty-six".