2107168688881 has 3 divisors (see below), whose sum is σ = 2107170140491. Its totient is φ = 2107167237272.

The previous prime is 2107168688851. The next prime is 2107168688887. The reversal of 2107168688881 is 1888868617012.

The square root of 2107168688881 is 1451609.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 67413448881 + 2039755240000 = 259641^2 + 1428200^2 .

It is not a de Polignac number, because 2107168688881 - 2¹⁵ = 2107168656113 is a prime.

It is a super-2 number, since 2×2107168688881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2107168688887) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 725805 + ... + 2177413.

Almost surely, 2^{2107168688881} is an apocalyptic number.

2107168688881 is the 1451609-th square number.

2107168688881 is the 725805-th centered octagonal number.

It is an amenable number.

2107168688881 is a deficient number, since it is larger than the sum of its proper divisors (1451610).

2107168688881 is an frugal number, since it uses more digits than its factorization.

2107168688881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903218 (or 1451609 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 64.

Multiplying 2107168688881 by its sum of digits (64), we get a square (134858796088384 = 11612872²).

The spelling of 2107168688881 in words is "two trillion, one hundred seven billion, one hundred sixty-eight million, six hundred eighty-eight thousand, eight hundred eighty-one".