666775868266 has 16 divisors (see below), whose sum is σ = 1105040314944. Its totient is φ = 300134405824.

The previous prime is 666775868237. The next prime is 666775868303. The reversal of 666775868266 is 662868577666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426326500 + ... + 426328063.

It is an arithmetic number, because the mean of its divisors is an integer number (69065019684).

Almost surely, 2^666775868266 is an apocalyptic number.

666775868266 is a deficient number, since it is larger than the sum of its proper divisors (438264446678).

666775868266 is a wasteful number, since it uses less digits than its factorization.

666775868266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852654605.

The product of its digits is 1463132160, while the sum is 73.

The spelling of 666775868266 in words is "six hundred sixty-six billion, seven hundred seventy-five million, eight hundred sixty-eight thousand, two hundred sixty-six".