6688209442 has 4 divisors (see below), whose sum is σ = 10032314166. Its totient is φ = 3344104720.

The previous prime is 6688209431. The next prime is 6688209449. The reversal of 6688209442 is 2449028866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4289071081 + 2399138361 = 65491^2 + 48981^2 .

It is not an unprimeable number, because it can be changed into a prime (6688209449) 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, 1672052359 + ... + 1672052362.

Almost surely, 2^6688209442 is an apocalyptic number.

6688209442 is a deficient number, since it is larger than the sum of its proper divisors (3344104724).

6688209442 is a wasteful number, since it uses less digits than its factorization.

6688209442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344104723.

The product of its (nonzero) digits is 1327104, while the sum is 49.

The square root of 6688209442 is about 81781.4737089030. The cubic root of 6688209442 is about 1884.0971308163.

The spelling of 6688209442 in words is "six billion, six hundred eighty-eight million, two hundred nine thousand, four hundred forty-two".