6611444981 has 2 divisors, whose sum is σ = 6611444982. Its totient is φ = 6611444980.

The previous prime is 6611444977. The next prime is 6611444999. The reversal of 6611444981 is 1894441166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6611316100 + 128881 = 81310^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 6611444981 - 2² = 6611444977 is a prime.

It is a super-2 number, since 2×6611444981² = 87422409473580180722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6611444941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305722490 + 3305722491.

It is an arithmetic number, because the mean of its divisors is an integer number (3305722491).

Almost surely, 2^6611444981 is an apocalyptic number.

It is an amenable number.

6611444981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6611444981 is an equidigital number, since it uses as much as digits as its factorization.

6611444981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 44.

The square root of 6611444981 is about 81310.7925247319. The cubic root of 6611444981 is about 1876.8610836501.

The spelling of 6611444981 in words is "six billion, six hundred eleven million, four hundred forty-four thousand, nine hundred eighty-one".