6666740742 has 16 divisors (see below), whose sum is σ = 13470941232. Its totient is φ = 2199336960.

The previous prime is 6666740699. The next prime is 6666740749. The reversal of 6666740742 is 2470476666.

It is a junction number, because it is equal to n+sod(n) for n = 6666740691 and 6666740700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666740749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5726859 + ... + 5728022.

It is an arithmetic number, because the mean of its divisors is an integer number (841933827).

Almost surely, 2^6666740742 is an apocalyptic number.

6666740742 is an abundant number, since it is smaller than the sum of its proper divisors (6804200490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6666740742 is a wasteful number, since it uses less digits than its factorization.

6666740742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11454983.

The product of its (nonzero) digits is 2032128, while the sum is 48.

The square root of 6666740742 is about 81650.1117084355. Note that the first 3 decimals coincide. The cubic root of 6666740742 is about 1882.0790284920.

The spelling of 6666740742 in words is "six billion, six hundred sixty-six million, seven hundred forty thousand, seven hundred forty-two".