2166244034165 has 4 divisors (see below), whose sum is σ = 2599492841004. Its totient is φ = 1732995227328.

The previous prime is 2166244034111. The next prime is 2166244034261. The reversal of 2166244034165 is 5614304426612.

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 1096877087761 + 1069366946404 = 1047319^2 + 1034102^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166244034165 - 2¹⁰ = 2166244033141 is a prime.

It is a super-2 number, since 2×2166244034165² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 216624403412 + ... + 216624403421.

It is an arithmetic number, because the mean of its divisors is an integer number (649873210251).

Almost surely, 2^{2166244034165} is an apocalyptic number.

It is an amenable number.

2166244034165 is a deficient number, since it is larger than the sum of its proper divisors (433248806839).

2166244034165 is an equidigital number, since it uses as much as digits as its factorization.

2166244034165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433248806838.

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 2166244034165 in words is "two trillion, one hundred sixty-six billion, two hundred forty-four million, thirty-four thousand, one hundred sixty-five".