6666600066 has 16 divisors (see below), whose sum is σ = 15237943104. Its totient is φ = 1904742864.

The previous prime is 6666600049. The next prime is 6666600067. The reversal of 6666600066 is 6600066666.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 158728573 = 6666600066 / (6 + 6 + 6 + 6 + 6 + 0 + 0 + 0 + 6 + 6).

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6666600067) 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, 79364245 + ... + 79364328.

It is an arithmetic number, because the mean of its divisors is an integer number (952371444).

Almost surely, 2^6666600066 is an apocalyptic number.

6666600066 is an abundant number, since it is smaller than the sum of its proper divisors (8571343038).

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

6666600066 is a wasteful number, since it uses less digits than its factorization.

6666600066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158728585.

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 6666600066 is about 81649.2502476293. The cubic root of 6666600066 is about 1882.0657903785.

The spelling of 6666600066 in words is "six billion, six hundred sixty-six million, six hundred thousand, sixty-six".