66857212 has 6 divisors (see below), whose sum is σ = 117000128. Its totient is φ = 33428604.

The previous prime is 66857201. The next prime is 66857227. The reversal of 66857212 is 21275866.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8357148 + ... + 8357155.

Almost surely, 2^66857212 is an apocalyptic number.

It is an amenable number.

66857212 is a deficient number, since it is larger than the sum of its proper divisors (50142916).

66857212 is a wasteful number, since it uses less digits than its factorization.

66857212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16714307 (or 16714305 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 66857212 is about 8176.6259545120. The cubic root of 66857212 is about 405.8660773076.

The spelling of 66857212 in words is "sixty-six million, eight hundred fifty-seven thousand, two hundred twelve".