6664343409 has 6 divisors (see below), whose sum is σ = 9626273826. Its totient is φ = 4442895600.

The previous prime is 6664343369. The next prime is 6664343429. The reversal of 6664343409 is 9043434666.

It can be written as a sum of positive squares in only one way, i.e., 6602375025 + 61968384 = 81255^2 + 7872^2 .

It is not a de Polignac number, because 6664343409 - 2¹⁷ = 6664212337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6664343429) 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 in 5 ways as a sum of consecutive naturals, for example, 370241292 + ... + 370241309.

It is an arithmetic number, because the mean of its divisors is an integer number (1604378971).

Almost surely, 2^6664343409 is an apocalyptic number.

It is an amenable number.

6664343409 is a deficient number, since it is larger than the sum of its proper divisors (2961930417).

6664343409 is a wasteful number, since it uses less digits than its factorization.

6664343409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740482607 (or 740482604 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 45.

The square root of 6664343409 is about 81635.4298635096. The cubic root of 6664343409 is about 1881.8534054439.

The spelling of 6664343409 in words is "six billion, six hundred sixty-four million, three hundred forty-three thousand, four hundred nine".