66038866 has 16 divisors (see below), whose sum is σ = 103661568. Its totient is φ = 31514400.

The previous prime is 66038837. The next prime is 66038873. The reversal of 66038866 is 66883066.

It is a super-3 number, since 3×66038866³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2770 + ... + 11821.

It is an arithmetic number, because the mean of its divisors is an integer number (6478848).

Almost surely, 2^66038866 is an apocalyptic number.

66038866 is a deficient number, since it is larger than the sum of its proper divisors (37622702).

66038866 is a wasteful number, since it uses less digits than its factorization.

66038866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14697.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 66038866 is about 8126.4300895289. The cubic root of 66038866 is about 404.2033131802.

The spelling of 66038866 in words is "sixty-six million, thirty-eight thousand, eight hundred sixty-six".