66555212 has 12 divisors (see below), whose sum is σ = 116546976. Its totient is φ = 33256080.

The previous prime is 66555199. The next prime is 66555241. The reversal of 66555212 is 21255566.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3038 + ... + 11930.

It is an arithmetic number, because the mean of its divisors is an integer number (9712248).

Almost surely, 2^66555212 is an apocalyptic number.

It is an amenable number.

66555212 is a deficient number, since it is larger than the sum of its proper divisors (49991764).

66555212 is a wasteful number, since it uses less digits than its factorization.

66555212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10768 (or 10766 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

The square root of 66555212 is about 8158.1377777039. The cubic root of 66555212 is about 405.2540437325.

The spelling of 66555212 in words is "sixty-six million, five hundred fifty-five thousand, two hundred twelve".