66556612 has 24 divisors (see below), whose sum is σ = 121289112. Its totient is φ = 31929600.

The previous prime is 66556583. The next prime is 66556613. The reversal of 66556612 is 21665566.

It can be written as a sum of positive squares in 4 ways, for example, as 15634116 + 50922496 = 3954^2 + 7136^2 .

It is not an unprimeable number, because it can be changed into a prime (66556613) 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, 6678 + ... + 13330.

It is an arithmetic number, because the mean of its divisors is an integer number (5053713).

Almost surely, 2^66556612 is an apocalyptic number.

It is an amenable number.

66556612 is a deficient number, since it is larger than the sum of its proper divisors (54732500).

66556612 is a wasteful number, since it uses less digits than its factorization.

66556612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759 (or 6757 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 66556612 is about 8158.2235811480. The cubic root of 66556612 is about 405.2568852414.

The spelling of 66556612 in words is "sixty-six million, five hundred fifty-six thousand, six hundred twelve".