266864785721 has 16 divisors (see below), whose sum is σ = 270541759488. Its totient is φ = 263220710400.

The previous prime is 266864785717. The next prime is 266864785729. The reversal of 266864785721 is 127587468662.

266864785721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 266864785721 - 2² = 266864785717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266864785729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11305151 + ... + 11328731.

It is an arithmetic number, because the mean of its divisors is an integer number (16908859968).

Almost surely, 2^266864785721 is an apocalyptic number.

It is an amenable number.

266864785721 is a deficient number, since it is larger than the sum of its proper divisors (3676973767).

266864785721 is a wasteful number, since it uses less digits than its factorization.

266864785721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24272.

The product of its digits is 54190080, while the sum is 62.

The spelling of 266864785721 in words is "two hundred sixty-six billion, eight hundred sixty-four million, seven hundred eighty-five thousand, seven hundred twenty-one".