2165543131105 has 32 divisors (see below), whose sum is σ = 2761587108000. Its totient is φ = 1624564580352.

The previous prime is 2165543131061. The next prime is 2165543131177. The reversal of 2165543131105 is 5011313455612.

It can be written as a sum of positive squares in 16 ways, for example, as 43323508449 + 2122219622656 = 208143^2 + 1456784^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165543131105 - 2⁷ = 2165543130977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38209869 + ... + 38266501.

It is an arithmetic number, because the mean of its divisors is an integer number (86299597125).

Almost surely, 2^{2165543131105} is an apocalyptic number.

It is an amenable number.

2165543131105 is a deficient number, since it is larger than the sum of its proper divisors (596043976895).

2165543131105 is a wasteful number, since it uses less digits than its factorization.

2165543131105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58293.

The product of its (nonzero) digits is 54000, while the sum is 37.

Adding to 2165543131105 its reverse (5011313455612), we get a palindrome (7176856586717).

The spelling of 2165543131105 in words is "two trillion, one hundred sixty-five billion, five hundred forty-three million, one hundred thirty-one thousand, one hundred five".