6666402349 has 2 divisors, whose sum is σ = 6666402350. Its totient is φ = 6666402348.

The previous prime is 6666402313. The next prime is 6666402427. The reversal of 6666402349 is 9432046666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5729430249 + 936972100 = 75693^2 + 30610^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666402349 - 2¹³ = 6666394157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6666402299 and 6666402308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666408349) 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, 3333201174 + 3333201175.

It is an arithmetic number, because the mean of its divisors is an integer number (3333201175).

Almost surely, 2^6666402349 is an apocalyptic number.

It is an amenable number.

6666402349 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666402349 is an equidigital number, since it uses as much as digits as its factorization.

6666402349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 46.

The square root of 6666402349 is about 81648.0394681954. The cubic root of 6666402349 is about 1882.0471841886.

The spelling of 6666402349 in words is "six billion, six hundred sixty-six million, four hundred two thousand, three hundred forty-nine".