66661112 has 32 divisors (see below), whose sum is σ = 143109120. Its totient is φ = 28516320.

The previous prime is 66661109. The next prime is 66661151. The reversal of 66661112 is 21116666.

It is a congruent number.

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, 53537 + ... + 54767.

It is an arithmetic number, because the mean of its divisors is an integer number (4472160).

Almost surely, 2^66661112 is an apocalyptic number.

It is an amenable number.

66661112 is an abundant number, since it is smaller than the sum of its proper divisors (76448008).

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

66661112 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (66661111) it forms an eRAP, since the sums of their prime factors are consecutive (2210 and 2211).

66661112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211 (or 2207 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 66661112 is about 8164.6256497160. The cubic root of 66661112 is about 405.4688711905.

Adding to 66661112 its reverse (21116666), we get a palindrome (87777778).

The spelling of 66661112 in words is "sixty-six million, six hundred sixty-one thousand, one hundred twelve".