66943442217 has 8 divisors (see below), whose sum is σ = 89265115296. Its totient is φ = 44625365312.

The previous prime is 66943442213. The next prime is 66943442239. The reversal of 66943442217 is 71224434966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66943442217 - 2² = 66943442213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66943442213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855303 + ... + 930284.

It is an arithmetic number, because the mean of its divisors is an integer number (11158139412).

Almost surely, 2^66943442217 is an apocalyptic number.

It is an amenable number.

66943442217 is a deficient number, since it is larger than the sum of its proper divisors (22321673079).

66943442217 is a wasteful number, since it uses less digits than its factorization.

66943442217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798087.

The product of its digits is 1741824, while the sum is 48.

The spelling of 66943442217 in words is "sixty-six billion, nine hundred forty-three million, four hundred forty-two thousand, two hundred seventeen".