2171656066717 has 16 divisors (see below), whose sum is σ = 2258716654080. Its totient is φ = 2085714892800.

The previous prime is 2171656066711. The next prime is 2171656066729. The reversal of 2171656066717 is 7176606561712.

It is a cyclic number.

It is not a de Polignac number, because 2171656066717 - 2³ = 2171656066709 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 (2171656066711) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1838709 + ... + 2779237.

It is an arithmetic number, because the mean of its divisors is an integer number (141169790880).

Almost surely, 2^{2171656066717} is an apocalyptic number.

It is an amenable number.

2171656066717 is a deficient number, since it is larger than the sum of its proper divisors (87060587363).

2171656066717 is a wasteful number, since it uses less digits than its factorization.

2171656066717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941124.

The product of its (nonzero) digits is 4445280, while the sum is 55.

The spelling of 2171656066717 in words is "two trillion, one hundred seventy-one billion, six hundred fifty-six million, sixty-six thousand, seven hundred seventeen".