660666611 has 8 divisors (see below), whose sum is σ = 721828800. Its totient is φ = 599688040.

The previous prime is 660666593. The next prime is 660666641. The reversal of 660666611 is 116666066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660666611 - 2²⁶ = 593557747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660666641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38321 + ... + 52818.

It is an arithmetic number, because the mean of its divisors is an integer number (90228600).

Almost surely, 2^660666611 is an apocalyptic number.

660666611 is a deficient number, since it is larger than the sum of its proper divisors (61162189).

660666611 is a wasteful number, since it uses less digits than its factorization.

660666611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91809.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 660666611 is about 25703.4357820117. The cubic root of 660666611 is about 870.9517971077.

The spelling of 660666611 in words is "six hundred sixty million, six hundred sixty-six thousand, six hundred eleven".