66643563214 has 4 divisors (see below), whose sum is σ = 99965344824. Its totient is φ = 33321781606.

The previous prime is 66643563199. The next prime is 66643563223. The reversal of 66643563214 is 41236534666.

It is a semiprime because it is the product of two primes.

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, 16660890802 + ... + 16660890805.

It is an arithmetic number, because the mean of its divisors is an integer number (24991336206).

Almost surely, 2^66643563214 is an apocalyptic number.

66643563214 is a deficient number, since it is larger than the sum of its proper divisors (33321781610).

66643563214 is a wasteful number, since it uses less digits than its factorization.

66643563214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33321781609.

The product of its digits is 1866240, while the sum is 46.

The spelling of 66643563214 in words is "sixty-six billion, six hundred forty-three million, five hundred sixty-three thousand, two hundred fourteen".