66643563216 has 80 divisors (see below), whose sum is σ = 180757627200. Its totient is φ = 21128346624.

The previous prime is 66643563199. The next prime is 66643563223. The reversal of 66643563216 is 61236534666.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264021 + ... + 450548.

It is an arithmetic number, because the mean of its divisors is an integer number (2259470340).

Almost surely, 2^66643563216 is an apocalyptic number.

It is an amenable number.

66643563216 is an abundant number, since it is smaller than the sum of its proper divisors (114114063984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66643563216 is a wasteful number, since it uses less digits than its factorization.

66643563216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714676 (or 714670 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 48.

The spelling of 66643563216 in words is "sixty-six billion, six hundred forty-three million, five hundred sixty-three thousand, two hundred sixteen".