6944555581 has 2 divisors, whose sum is σ = 6944555582. Its totient is φ = 6944555580.

The previous prime is 6944555543. The next prime is 6944555591. The reversal of 6944555581 is 1855554496.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6944555556 + 25 = 83334^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 6944555581 - 2²⁹ = 6407684669 is a prime.

It is a super-2 number, since 2×6944555581² = 96453704435196495122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6944555521) 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 as a sum of consecutive naturals, namely, 3472277790 + 3472277791.

It is an arithmetic number, because the mean of its divisors is an integer number (3472277791).

Almost surely, 2^6944555581 is an apocalyptic number.

It is an amenable number.

6944555581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6944555581 is an equidigital number, since it uses as much as digits as its factorization.

6944555581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320000, while the sum is 52.

The square root of 6944555581 is about 83334.0001499988. Note that the first 3 decimals coincide. The cubic root of 6944555581 is about 1907.8672484358.

The spelling of 6944555581 in words is "six billion, nine hundred forty-four million, five hundred fifty-five thousand, five hundred eighty-one".