6669389381 has 2 divisors, whose sum is σ = 6669389382. Its totient is φ = 6669389380.

The previous prime is 6669389303. The next prime is 6669389393. The reversal of 6669389381 is 1839839666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6669172225 + 217156 = 81665^2 + 466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6669389381 is a prime.

It is a super-2 number, since 2×6669389381² = 88961509430791126322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6669389381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6669389081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334694690 + 3334694691.

It is an arithmetic number, because the mean of its divisors is an integer number (3334694691).

Almost surely, 2^6669389381 is an apocalyptic number.

It is an amenable number.

6669389381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669389381 is an equidigital number, since it uses as much as digits as its factorization.

6669389381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 59.

The square root of 6669389381 is about 81666.3295428416. The cubic root of 6669389381 is about 1882.3282401181.

The spelling of 6669389381 in words is "six billion, six hundred sixty-nine million, three hundred eighty-nine thousand, three hundred eighty-one".