66688821078213 has 8 divisors (see below), whose sum is σ = 89415179100000. Its totient is φ = 44210838554288.

The previous prime is 66688821078203. The next prime is 66688821078233. The reversal of 66688821078213 is 31287012888666.

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 66688821078213 - 2²⁶ = 66688753969349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66688821078203) 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, 62093873838 + ... + 62093874911.

It is an arithmetic number, because the mean of its divisors is an integer number (11176897387500).

Almost surely, 2^{66688821078213} is an apocalyptic number.

It is an amenable number.

66688821078213 is a deficient number, since it is larger than the sum of its proper divisors (22726358021787).

66688821078213 is a wasteful number, since it uses less digits than its factorization.

66688821078213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124187748931.

The product of its (nonzero) digits is 74317824, while the sum is 66.

The spelling of 66688821078213 in words is "sixty-six trillion, six hundred eighty-eight billion, eight hundred twenty-one million, seventy-eight thousand, two hundred thirteen".