66703866 has 32 divisors (see below), whose sum is σ = 137937600. Its totient is φ = 21492480.

The previous prime is 66703849. The next prime is 66703867. The reversal of 66703866 is 66830766.

It is not an unprimeable number, because it can be changed into a prime (66703867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20050 + ... + 23138.

It is an arithmetic number, because the mean of its divisors is an integer number (4310550).

Almost surely, 2^66703866 is an apocalyptic number.

66703866 is an abundant number, since it is smaller than the sum of its proper divisors (71233734).

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

66703866 is a wasteful number, since it uses less digits than its factorization.

66703866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214.

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

The square root of 66703866 is about 8167.2434762287. The cubic root of 66703866 is about 405.5555369682. Note that the first 4 decimals are identical.

The spelling of 66703866 in words is "sixty-six million, seven hundred three thousand, eight hundred sixty-six".