2171868516717 has 16 divisors (see below), whose sum is σ = 2899692681600. Its totient is φ = 1445978921472.

The previous prime is 2171868516703. The next prime is 2171868516731. The reversal of 2171868516717 is 7176158681712.

It is an interprime number because it is at equal distance from previous prime (2171868516703) and next prime (2171868516731).

It is not a de Polignac number, because 2171868516717 - 2¹² = 2171868512621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171868516017) 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, 15869493 + ... + 16005765.

It is an arithmetic number, because the mean of its divisors is an integer number (181230792600).

Almost surely, 2^{2171868516717} is an apocalyptic number.

It is an amenable number.

2171868516717 is a deficient number, since it is larger than the sum of its proper divisors (727824164883).

2171868516717 is a wasteful number, since it uses less digits than its factorization.

2171868516717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143332.

The product of its digits is 7902720, while the sum is 60.

The spelling of 2171868516717 in words is "two trillion, one hundred seventy-one billion, eight hundred sixty-eight million, five hundred sixteen thousand, seven hundred seventeen".