6639955226 has 8 divisors (see below), whose sum is σ = 10128745440. Its totient is φ = 3263706748.

The previous prime is 6639955219. The next prime is 6639955229. The reversal of 6639955226 is 6225599366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6639955226² = 88178010806569422152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6639955229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28135286 + ... + 28135521.

It is an arithmetic number, because the mean of its divisors is an integer number (1266093180).

Almost surely, 2^6639955226 is an apocalyptic number.

6639955226 is a deficient number, since it is larger than the sum of its proper divisors (3488790214).

6639955226 is a wasteful number, since it uses less digits than its factorization.

6639955226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56270868.

The product of its digits is 5248800, while the sum is 53.

The square root of 6639955226 is about 81485.9204157381. The cubic root of 6639955226 is about 1879.5550503131. Note that the first 3 decimals are identical.

The spelling of 6639955226 in words is "six billion, six hundred thirty-nine million, nine hundred fifty-five thousand, two hundred twenty-six".