2106611307889 has 9 divisors (see below), whose sum is σ = 2315548986681. Its totient is φ = 1915086674820.

The previous prime is 2106611307833. The next prime is 2106611307947. The reversal of 2106611307889 is 9887031166012.

The square root of 2106611307889 is 1451417.

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

It is not a de Polignac number, because 2106611307889 - 2⁷ = 2106611307761 is a prime.

It is a super-2 number, since 2×2106611307889² (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 (2106611377889) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15899614 + ... + 16031560.

Almost surely, 2^{2106611307889} is an apocalyptic number.

2106611307889 is the 1451417-th square number.

2106611307889 is the 725709-th centered octagonal number.

It is an amenable number.

2106611307889 is a deficient number, since it is larger than the sum of its proper divisors (208937678792).

2106611307889 is an frugal number, since it uses more digits than its factorization.

2106611307889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263916 (or 131958 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 2106611307889 in words is "two trillion, one hundred six billion, six hundred eleven million, three hundred seven thousand, eight hundred eighty-nine".