66728385601 has 8 divisors (see below), whose sum is σ = 70702709760. Its totient is φ = 62759519808.

The previous prime is 66728385587. The next prime is 66728385613. The reversal of 66728385601 is 10658382766.

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 66728385601 - 2⁵ = 66728385569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66728389601) 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, 1339401 + ... + 1388326.

It is an arithmetic number, because the mean of its divisors is an integer number (8837838720).

Almost surely, 2^66728385601 is an apocalyptic number.

It is an amenable number.

66728385601 is a deficient number, since it is larger than the sum of its proper divisors (3974324159).

66728385601 is a wasteful number, since it uses less digits than its factorization.

66728385601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729183.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 66728385601 in words is "sixty-six billion, seven hundred twenty-eight million, three hundred eighty-five thousand, six hundred one".