66730866 has 16 divisors (see below), whose sum is σ = 139264704. Its totient is φ = 21276464.

The previous prime is 66730837. The next prime is 66730897. The reversal of 66730866 is 66803766.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 241641 + ... + 241916.

It is an arithmetic number, because the mean of its divisors is an integer number (8704044).

Almost surely, 2^66730866 is an apocalyptic number.

66730866 is an abundant number, since it is smaller than the sum of its proper divisors (72533838).

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

66730866 is a wasteful number, since it uses less digits than its factorization.

66730866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483585.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 66730866 is about 8168.8962534727. The cubic root of 66730866 is about 405.6102490515.

Subtracting 66730866 from its reverse (66803766), we obtain a square (72900 = 270²).

The spelling of 66730866 in words is "sixty-six million, seven hundred thirty thousand, eight hundred sixty-six".