66616616 has 32 divisors (see below), whose sum is σ = 136637280. Its totient is φ = 30196800.

The previous prime is 66616609. The next prime is 66616621. The reversal of 66616616 is 61661666.

It is a super-3 number, since 3×66616616³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66616616.

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, 40286 + ... + 41906.

It is an arithmetic number, because the mean of its divisors is an integer number (4269915).

Almost surely, 2^66616616 is an apocalyptic number.

It is an amenable number.

66616616 is an abundant number, since it is smaller than the sum of its proper divisors (70020664).

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

66616616 is a wasteful number, since it uses less digits than its factorization.

66616616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105 (or 2101 counting only the distinct ones).

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

The square root of 66616616 is about 8161.9002689325. The cubic root of 66616616 is about 405.3786348788.

The spelling of 66616616 in words is "sixty-six million, six hundred sixteen thousand, six hundred sixteen".