6666746868 has 36 divisors (see below), whose sum is σ = 16897268388. Its totient is φ = 2216286720.

The previous prime is 6666746851. The next prime is 6666746873. The reversal of 6666746868 is 8686476666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4926355344 + 1740391524 = 70188^2 + 41718^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234813 + ... + 261668.

Almost surely, 2^6666746868 is an apocalyptic number.

It is an amenable number.

6666746868 is an abundant number, since it is smaller than the sum of its proper divisors (10230521520).

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

6666746868 is a wasteful number, since it uses less digits than its factorization.

6666746868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496864 (or 496859 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 63.

The square root of 6666746868 is about 81650.1492221539. The cubic root of 6666746868 is about 1882.0796049662.

The spelling of 6666746868 in words is "six billion, six hundred sixty-six million, seven hundred forty-six thousand, eight hundred sixty-eight".