6622556218 has 4 divisors (see below), whose sum is σ = 9933834330. Its totient is φ = 3311278108.

The previous prime is 6622556209. The next prime is 6622556219. The reversal of 6622556218 is 8126552266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5171479569 + 1451076649 = 71913^2 + 38093^2 .

It is not an unprimeable number, because it can be changed into a prime (6622556219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1655639053 + ... + 1655639056.

Almost surely, 2^6622556218 is an apocalyptic number.

6622556218 is a deficient number, since it is larger than the sum of its proper divisors (3311278112).

6622556218 is a wasteful number, since it uses less digits than its factorization.

6622556218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311278111.

The product of its digits is 345600, while the sum is 43.

The square root of 6622556218 is about 81379.0895623685. The cubic root of 6622556218 is about 1877.9119167976.

The spelling of 6622556218 in words is "six billion, six hundred twenty-two million, five hundred fifty-six thousand, two hundred eighteen".