6631221366 has 48 divisors (see below), whose sum is σ = 17912913408. Its totient is φ = 1722394800.

The previous prime is 6631221329. The next prime is 6631221419.

6631221366 is a `hidden beast` number, since 6 + 631 + 2 + 2 + 13 + 6 + 6 = 666.

6631221366 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 6631221366.

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, 2390830 + ... + 2393601.

It is an arithmetic number, because the mean of its divisors is an integer number (373185696).

Almost surely, 2^6631221366 is an apocalyptic number.

6631221366 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6631221366 is an abundant number, since it is smaller than the sum of its proper divisors (11281692042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6631221366 is a wasteful number, since it uses less digits than its factorization.

6631221366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4784457 (or 4784454 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 6631221366 is about 81432.3115599699. The cubic root of 6631221366 is about 1878.7305982966.

It can be divided in two parts, 66312 and 21366, that added together give a palindrome (87678).

The spelling of 6631221366 in words is "six billion, six hundred thirty-one million, two hundred twenty-one thousand, three hundred sixty-six".