666563266 has 8 divisors (see below), whose sum is σ = 999993744. Its totient is φ = 333232020.

The previous prime is 666563257. The next prime is 666563267. The reversal of 666563266 is 662365666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (666563267) 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 in 3 ways as a sum of consecutive naturals, for example, 4780 + ... + 36823.

It is an arithmetic number, because the mean of its divisors is an integer number (124999218).

Almost surely, 2^666563266 is an apocalyptic number.

666563266 is a deficient number, since it is larger than the sum of its proper divisors (333430478).

666563266 is a wasteful number, since it uses less digits than its factorization.

666563266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49616.

The product of its digits is 1399680, while the sum is 46.

The square root of 666563266 is about 25817.8865517687. The cubic root of 666563266 is about 873.5352979999.

The spelling of 666563266 in words is "six hundred sixty-six million, five hundred sixty-three thousand, two hundred sixty-six".