6668736742 has 4 divisors (see below), whose sum is σ = 10003105116. Its totient is φ = 3334368370.

The previous prime is 6668736721. The next prime is 6668736757. The reversal of 6668736742 is 2476378666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2476378666 = 2 ⋅1238189333.

It is a congruent number.

It is an unprimeable number.

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, 1667184184 + ... + 1667184187.

It is an arithmetic number, because the mean of its divisors is an integer number (2500776279).

Almost surely, 2^6668736742 is an apocalyptic number.

6668736742 is a deficient number, since it is larger than the sum of its proper divisors (3334368374).

6668736742 is a wasteful number, since it uses less digits than its factorization.

6668736742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334368373.

The product of its digits is 12192768, while the sum is 55.

The square root of 6668736742 is about 81662.3336796102. Note that the first 3 decimals coincide. The cubic root of 6668736742 is about 1882.2668391500.

The spelling of 6668736742 in words is "six billion, six hundred sixty-eight million, seven hundred thirty-six thousand, seven hundred forty-two".