66872015717 has 8 divisors (see below), whose sum is σ = 72019405920. Its totient is φ = 61725109680.

The previous prime is 66872015633. The next prime is 66872015719. The reversal of 66872015717 is 71751027866.

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

It is a de Polignac number, because none of the positive numbers 2^k-66872015717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66872015719) 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, 196742 + ... + 415272.

It is an arithmetic number, because the mean of its divisors is an integer number (9002425740).

Almost surely, 2^66872015717 is an apocalyptic number.

It is an amenable number.

66872015717 is a deficient number, since it is larger than the sum of its proper divisors (5147390203).

66872015717 is a wasteful number, since it uses less digits than its factorization.

66872015717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242083.

The product of its (nonzero) digits is 987840, while the sum is 50.

The spelling of 66872015717 in words is "sixty-six billion, eight hundred seventy-two million, fifteen thousand, seven hundred seventeen".