266564456 has 8 divisors (see below), whose sum is σ = 499808370. Its totient is φ = 133282224.

The previous prime is 266564453. The next prime is 266564461. The reversal of 266564456 is 654465662.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 170720356 + 95844100 = 13066^2 + 9790^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (266564453) 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 as a sum of consecutive naturals, namely, 16660271 + ... + 16660286.

Almost surely, 2^266564456 is an apocalyptic number.

It is an amenable number.

266564456 is a deficient number, since it is larger than the sum of its proper divisors (233243914).

266564456 is a wasteful number, since it uses less digits than its factorization.

266564456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33320563 (or 33320559 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 44.

The square root of 266564456 is about 16326.8017688707. The cubic root of 266564456 is about 643.5773431334.

The spelling of 266564456 in words is "two hundred sixty-six million, five hundred sixty-four thousand, four hundred fifty-six".