20171660117 has 6 divisors (see below), whose sum is σ = 23464992438. Its totient is φ = 17289994344.

The previous prime is 20171660083. The next prime is 20171660129. The reversal of 20171660117 is 71106617102.

It can be written as a sum of positive squares in only one way, i.e., 16939282801 + 3232377316 = 130151^2 + 56854^2 .

It is not a de Polignac number, because 20171660117 - 2¹⁴ = 20171643733 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 (20171660147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 205833218 + ... + 205833315.

It is an arithmetic number, because the mean of its divisors is an integer number (3910832073).

Almost surely, 2^20171660117 is an apocalyptic number.

It is an amenable number.

20171660117 is a deficient number, since it is larger than the sum of its proper divisors (3293332321).

20171660117 is an equidigital number, since it uses as much as digits as its factorization.

20171660117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411666547 (or 411666540 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 32.

The spelling of 20171660117 in words is "twenty billion, one hundred seventy-one million, six hundred sixty thousand, one hundred seventeen".