6606666066 has 128 divisors (see below), whose sum is σ = 17889564672. Its totient is φ = 1583841600.

The previous prime is 6606666047. The next prime is 6606666083.

6606666066 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 722181 + ... + 731271.

It is an arithmetic number, because the mean of its divisors is an integer number (139762224).

Almost surely, 2^6606666066 is an apocalyptic number.

6606666066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6606666066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8944782336).

6606666066 is an abundant number, since it is smaller than the sum of its proper divisors (11282898606).

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

6606666066 is a wasteful number, since it uses less digits than its factorization.

6606666066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9149 (or 9127 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 48.

The square root of 6606666066 is about 81281.4004923636. The cubic root of 6606666066 is about 1876.4087608689.

It can be divided in two parts, 660 and 6666066, that added together give a triangular number (6666726 = T₃₆₅₁).

The spelling of 6606666066 in words is "six billion, six hundred six million, six hundred sixty-six thousand, sixty-six".