6666658120 has 128 divisors (see below), whose sum is σ = 16256972160. Its totient is φ = 2451271680.

The previous prime is 6666658073. The next prime is 6666658121. The reversal of 6666658120 is 218566666.

It is not an unprimeable number, because it can be changed into a prime (6666658121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5967802 + ... + 5968918.

It is an arithmetic number, because the mean of its divisors is an integer number (127007595).

Almost surely, 2^6666658120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6666658120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8128486080).

6666658120 is an abundant number, since it is smaller than the sum of its proper divisors (9590314040).

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

6666658120 is a wasteful number, since it uses less digits than its factorization.

6666658120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 6666658120 is about 81649.6057553250. The cubic root of 6666658120 is about 1882.0712534896.

The spelling of 6666658120 in words is "six billion, six hundred sixty-six million, six hundred fifty-eight thousand, one hundred twenty".