65217121715 has 8 divisors (see below), whose sum is σ = 78270184608. Its totient is φ = 52167271680.

The previous prime is 65217121679. The next prime is 65217121747. The reversal of 65217121715 is 51712171256.

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

It is not a de Polignac number, because 65217121715 - 2¹⁸ = 65216859571 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758327 + ... + 839936.

It is an arithmetic number, because the mean of its divisors is an integer number (9783773076).

Almost surely, 2^65217121715 is an apocalyptic number.

65217121715 is a deficient number, since it is larger than the sum of its proper divisors (13053062893).

65217121715 is a wasteful number, since it uses less digits than its factorization.

65217121715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606429.

The product of its digits is 29400, while the sum is 38.

The spelling of 65217121715 in words is "sixty-five billion, two hundred seventeen million, one hundred twenty-one thousand, seven hundred fifteen".