2111601172165 has 4 divisors (see below), whose sum is σ = 2533921406604. Its totient is φ = 1689280937728.

The previous prime is 2111601172157. The next prime is 2111601172201. The reversal of 2111601172165 is 5612711061112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 930156086916 + 1181445085249 = 964446^2 + 1086943^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111601172165 - 2³ = 2111601172157 is a prime.

It is a super-3 number, since 3×2111601172165³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111601172165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211160117212 + ... + 211160117221.

It is an arithmetic number, because the mean of its divisors is an integer number (633480351651).

Almost surely, 2^{2111601172165} is an apocalyptic number.

It is an amenable number.

2111601172165 is a deficient number, since it is larger than the sum of its proper divisors (422320234439).

2111601172165 is an equidigital number, since it uses as much as digits as its factorization.

2111601172165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422320234438.

The product of its (nonzero) digits is 5040, while the sum is 34.

The spelling of 2111601172165 in words is "two trillion, one hundred eleven billion, six hundred one million, one hundred seventy-two thousand, one hundred sixty-five".