666622808 has 32 divisors (see below), whose sum is σ = 1306229760. Its totient is φ = 318625440.

The previous prime is 666622807. The next prime is 666622811. The reversal of 666622808 is 808226666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666622807) 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 7 ways as a sum of consecutive naturals, for example, 4448 + ... + 36783.

It is an arithmetic number, because the mean of its divisors is an integer number (40819680).

Almost surely, 2^666622808 is an apocalyptic number.

It is an amenable number.

666622808 is a deficient number, since it is larger than the sum of its proper divisors (639606952).

666622808 is a wasteful number, since it uses less digits than its factorization.

666622808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41327 (or 41323 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 666622808 is about 25819.0396413190. The cubic root of 666622808 is about 873.5613072790.

The spelling of 666622808 in words is "six hundred sixty-six million, six hundred twenty-two thousand, eight hundred eight".