66166216 has 16 divisors (see below), whose sum is σ = 129456000. Its totient is φ = 31644624.

The previous prime is 66166201. The next prime is 66166223. The reversal of 66166216 is 61266166.

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, 179616 + ... + 179983.

It is an arithmetic number, because the mean of its divisors is an integer number (8091000).

Almost surely, 2^66166216 is an apocalyptic number.

It is an amenable number.

66166216 is a deficient number, since it is larger than the sum of its proper divisors (63289784).

66166216 is a wasteful number, since it uses less digits than its factorization.

66166216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359628 (or 359624 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 66166216 is about 8134.2618595666. The cubic root of 66166216 is about 404.4629695612.

The spelling of 66166216 in words is "sixty-six million, one hundred sixty-six thousand, two hundred sixteen".