647666222 has 48 divisors (see below), whose sum is σ = 1174687920. Its totient is φ = 266716800.

The previous prime is 647666209. The next prime is 647666233. The reversal of 647666222 is 222666746.

647666222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 647666222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 798197 + ... + 799007.

It is an arithmetic number, because the mean of its divisors is an integer number (24472665).

Almost surely, 2^647666222 is an apocalyptic number.

647666222 is a deficient number, since it is larger than the sum of its proper divisors (527021698).

647666222 is a wasteful number, since it uses less digits than its factorization.

647666222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137 (or 1130 counting only the distinct ones).

The product of its digits is 290304, while the sum is 41.

The square root of 647666222 is about 25449.2872591749. The cubic root of 647666222 is about 865.2011391431.

The spelling of 647666222 in words is "six hundred forty-seven million, six hundred sixty-six thousand, two hundred twenty-two".