6621881266 has 96 divisors (see below), whose sum is σ = 13740487488. Its totient is φ = 2352389760.

The previous prime is 6621881239. The next prime is 6621881267.

6621881266 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (6621881267) 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 47 ways as a sum of consecutive naturals, for example, 1160316 + ... + 1166008.

It is an arithmetic number, because the mean of its divisors is an integer number (143130078).

Almost surely, 2^6621881266 is an apocalyptic number.

6621881266 is an abundant number, since it is smaller than the sum of its proper divisors (7118606222).

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

6621881266 is a wasteful number, since it uses less digits than its factorization.

6621881266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5816 (or 5809 counting only the distinct ones).

The product of its digits is 331776, while the sum is 46.

The square root of 6621881266 is about 81374.9424946033. The cubic root of 6621881266 is about 1877.8481174919.

The spelling of 6621881266 in words is "six billion, six hundred twenty-one million, eight hundred eighty-one thousand, two hundred sixty-six".