6667646429 has 2 divisors, whose sum is σ = 6667646430. Its totient is φ = 6667646428.

The previous prime is 6667646417. The next prime is 6667646467. The reversal of 6667646429 is 9246467666.

6667646429 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6376022500 + 291623929 = 79850^2 + 17077^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6667646429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6667640429) 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, 3333823214 + 3333823215.

It is an arithmetic number, because the mean of its divisors is an integer number (3333823215).

Almost surely, 2^6667646429 is an apocalyptic number.

It is an amenable number.

6667646429 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667646429 is an equidigital number, since it uses as much as digits as its factorization.

6667646429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 56.

The square root of 6667646429 is about 81655.6576668145. The cubic root of 6667646429 is about 1882.1642524113.

The spelling of 6667646429 in words is "six billion, six hundred sixty-seven million, six hundred forty-six thousand, four hundred twenty-nine".