66728207220307 has 8 divisors (see below), whose sum is σ = 66994440130800. Its totient is φ = 66462025396224.

The previous prime is 66728207220211. The next prime is 66728207220317. The reversal of 66728207220307 is 70302270282766.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66728207220307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66728207220317) 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, 10152957 + ... + 15379822.

It is an arithmetic number, because the mean of its divisors is an integer number (8374305016350).

Almost surely, 2^{66728207220307} is an apocalyptic number.

66728207220307 is a deficient number, since it is larger than the sum of its proper divisors (266232910493).

66728207220307 is a wasteful number, since it uses less digits than its factorization.

66728207220307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25543205.

The product of its (nonzero) digits is 4741632, while the sum is 52.

The spelling of 66728207220307 in words is "sixty-six trillion, seven hundred twenty-eight billion, two hundred seven million, two hundred twenty thousand, three hundred seven".