6636221279 has 8 divisors (see below), whose sum is σ = 6739618560. Its totient is φ = 6533309016.

The previous prime is 6636221239. The next prime is 6636221309. The reversal of 6636221279 is 9721226366.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6636221279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6636221239) 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 7 ways as a sum of consecutive naturals, for example, 93629 + ... + 148454.

It is an arithmetic number, because the mean of its divisors is an integer number (842452320).

Almost surely, 2^6636221279 is an apocalyptic number.

6636221279 is a deficient number, since it is larger than the sum of its proper divisors (103397281).

6636221279 is a wasteful number, since it uses less digits than its factorization.

6636221279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242509.

The product of its digits is 326592, while the sum is 44.

The square root of 6636221279 is about 81463.0055853576. The cubic root of 6636221279 is about 1879.2026646590.

The spelling of 6636221279 in words is "six billion, six hundred thirty-six million, two hundred twenty-one thousand, two hundred seventy-nine".