6699229981 has 2 divisors, whose sum is σ = 6699229982. Its totient is φ = 6699229980.

The previous prime is 6699229963. The next prime is 6699229997. The reversal of 6699229981 is 1899229966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5887492900 + 811737081 = 76730^2 + 28491^2 .

It is a cyclic number.

It is not a de Polignac number, because 6699229981 - 2⁷ = 6699229853 is a prime.

It is a super-2 number, since 2×6699229981² = 89759364676658520722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6699229951) 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 as a sum of consecutive naturals, namely, 3349614990 + 3349614991.

It is an arithmetic number, because the mean of its divisors is an integer number (3349614991).

Almost surely, 2^6699229981 is an apocalyptic number.

It is an amenable number.

6699229981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6699229981 is an equidigital number, since it uses as much as digits as its factorization.

6699229981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7558272, while the sum is 61.

The square root of 6699229981 is about 81848.8239439028. The cubic root of 6699229981 is about 1885.1314072285.

The spelling of 6699229981 in words is "six billion, six hundred ninety-nine million, two hundred twenty-nine thousand, nine hundred eighty-one".