6628981861139 has 24 divisors (see below), whose sum is σ = 7378142303280. Its totient is φ = 5950751938560.

The previous prime is 6628981861133. The next prime is 6628981861141. The reversal of 6628981861139 is 9311681898266.

It is a happy number.

It is not a de Polignac number, because 6628981861139 - 2¹⁶ = 6628981795603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6628981861133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4562027 + ... + 5836955.

It is an arithmetic number, because the mean of its divisors is an integer number (307422595970).

Almost surely, 2^{6628981861139} is an apocalyptic number.

6628981861139 is a deficient number, since it is larger than the sum of its proper divisors (749160442141).

6628981861139 is a wasteful number, since it uses less digits than its factorization.

6628981861139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275491 (or 1275480 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 68.

The spelling of 6628981861139 in words is "six trillion, six hundred twenty-eight billion, nine hundred eighty-one million, eight hundred sixty-one thousand, one hundred thirty-nine".