6666743438 has 16 divisors (see below), whose sum is σ = 10068563904. Its totient is φ = 3310575840.

The previous prime is 6666743431. The next prime is 6666743467. The reversal of 6666743438 is 8343476666.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6666743438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666743431) 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 7 ways as a sum of consecutive naturals, for example, 950123 + ... + 957113.

It is an arithmetic number, because the mean of its divisors is an integer number (629285244).

Almost surely, 2^6666743438 is an apocalyptic number.

6666743438 is a deficient number, since it is larger than the sum of its proper divisors (3401820466).

6666743438 is a wasteful number, since it uses less digits than its factorization.

6666743438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10187.

The product of its digits is 10450944, while the sum is 53.

The square root of 6666743438 is about 81650.1282179030. The cubic root of 6666743438 is about 1882.0792821934.

The spelling of 6666743438 in words is "six billion, six hundred sixty-six million, seven hundred forty-three thousand, four hundred thirty-eight".