66212500216 has 8 divisors (see below), whose sum is σ = 124148437920. Its totient is φ = 33106250104.

The previous prime is 66212500187. The next prime is 66212500259. The reversal of 66212500216 is 61200521266.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4138281256 + ... + 4138281271.

It is an arithmetic number, because the mean of its divisors is an integer number (15518554740).

Almost surely, 2^66212500216 is an apocalyptic number.

It is an amenable number.

66212500216 is a deficient number, since it is larger than the sum of its proper divisors (57935937704).

66212500216 is a wasteful number, since it uses less digits than its factorization.

66212500216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8276562533 (or 8276562529 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 66212500216 in words is "sixty-six billion, two hundred twelve million, five hundred thousand, two hundred sixteen".