6639122243 has 6 divisors (see below), whose sum is σ = 7189108884. Its totient is φ = 6128420376.

The previous prime is 6639122239. The next prime is 6639122261. The reversal of 6639122243 is 3422219366.

It is not a de Polignac number, because 6639122243 - 2² = 6639122239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6639122197 and 6639122206.

It is not an unprimeable number, because it can be changed into a prime (6639122233) 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 5 ways as a sum of consecutive naturals, for example, 19642205 + ... + 19642542.

It is an arithmetic number, because the mean of its divisors is an integer number (1198184814).

Almost surely, 2^6639122243 is an apocalyptic number.

6639122243 is a deficient number, since it is larger than the sum of its proper divisors (549986641).

6639122243 is a wasteful number, since it uses less digits than its factorization.

6639122243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39284773 (or 39284760 counting only the distinct ones).

The product of its digits is 93312, while the sum is 38.

The square root of 6639122243 is about 81480.8090472843. The cubic root of 6639122243 is about 1879.4764502410.

The spelling of 6639122243 in words is "six billion, six hundred thirty-nine million, one hundred twenty-two thousand, two hundred forty-three".