820422666 has 24 divisors (see below), whose sum is σ = 2031523104. Its totient is φ = 234406440.

The previous prime is 820422623. The next prime is 820422683. The reversal of 820422666 is 666224028.

It is a self number, because there is not a number n which added to its sum of digits gives 820422666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3255520 + ... + 3255771.

It is an arithmetic number, because the mean of its divisors is an integer number (84646796).

Almost surely, 2^820422666 is an apocalyptic number.

820422666 is an abundant number, since it is smaller than the sum of its proper divisors (1211100438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820422666 is a wasteful number, since it uses less digits than its factorization.

820422666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6511306 (or 6511303 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 820422666 is about 28643.0212442752. The cubic root of 820422666 is about 936.1509522594.

The spelling of 820422666 in words is "eight hundred twenty million, four hundred twenty-two thousand, six hundred sixty-six".