66689116 has 24 divisors (see below), whose sum is σ = 127819440. Its totient is φ = 30256512.

The previous prime is 66689111. The next prime is 66689137. The reversal of 66689116 is 61198666.

It is a happy number.

It is a super-3 number, since 3×66689116³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66689111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7801 + ... + 13936.

It is an arithmetic number, because the mean of its divisors is an integer number (5325810).

Almost surely, 2^66689116 is an apocalyptic number.

It is an amenable number.

66689116 is a deficient number, since it is larger than the sum of its proper divisors (61130324).

66689116 is a wasteful number, since it uses less digits than its factorization.

66689116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21813 (or 21811 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 66689116 is about 8166.3404288580. The cubic root of 66689116 is about 405.5256417237.

The spelling of 66689116 in words is "sixty-six million, six hundred eighty-nine thousand, one hundred sixteen".