6638816212717 has 16 divisors (see below), whose sum is σ = 7164154287360. Its totient is φ = 6115583656512.

The previous prime is 6638816212667. The next prime is 6638816212747. The reversal of 6638816212717 is 7172126188366.

It is a cyclic number.

It is not a de Polignac number, because 6638816212717 - 2¹¹ = 6638816210669 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 (6638816212747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14002303 + ... + 14468659.

It is an arithmetic number, because the mean of its divisors is an integer number (447759642960).

Almost surely, 2^{6638816212717} is an apocalyptic number.

It is an amenable number.

6638816212717 is a deficient number, since it is larger than the sum of its proper divisors (525338074643).

6638816212717 is a wasteful number, since it uses less digits than its factorization.

6638816212717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468612.

The product of its digits is 8128512, while the sum is 58.

The spelling of 6638816212717 in words is "six trillion, six hundred thirty-eight billion, eight hundred sixteen million, two hundred twelve thousand, seven hundred seventeen".