66660611 has 4 divisors (see below), whose sum is σ = 67102224. Its totient is φ = 66219000.

The previous prime is 66660563. The next prime is 66660613. The reversal of 66660611 is 11606666.

66660611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66660611 - 2¹⁰ = 66659587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66660613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220580 + ... + 220881.

It is an arithmetic number, because the mean of its divisors is an integer number (16775556).

Almost surely, 2^66660611 is an apocalyptic number.

66660611 is a deficient number, since it is larger than the sum of its proper divisors (441613).

66660611 is a wasteful number, since it uses less digits than its factorization.

66660611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441612.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 66660611 is about 8164.5949685211. The cubic root of 66660611 is about 405.4678554038.

The spelling of 66660611 in words is "sixty-six million, six hundred sixty thousand, six hundred eleven".