6666687738 has 48 divisors (see below), whose sum is σ = 15217612800. Its totient is φ = 2103485760.

The previous prime is 6666687721. The next prime is 6666687761. The reversal of 6666687738 is 8377866666.

It is a Curzon 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 in 23 ways as a sum of consecutive naturals, for example, 429798 + ... + 445038.

It is an arithmetic number, because the mean of its divisors is an integer number (317033600).

Almost surely, 2^6666687738 is an apocalyptic number.

6666687738 is an abundant number, since it is smaller than the sum of its proper divisors (8550925062).

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

6666687738 is a wasteful number, since it uses less digits than its factorization.

6666687738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16547 (or 16544 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 63.

The square root of 6666687738 is about 81649.7871277078. The cubic root of 6666687738 is about 1882.0740406484.

The spelling of 6666687738 in words is "six billion, six hundred sixty-six million, six hundred eighty-seven thousand, seven hundred thirty-eight".