2115565165109 has 6 divisors (see below), whose sum is σ = 2325373280790. Its totient is φ = 1923241059080.

The previous prime is 2115565165069. The next prime is 2115565165139. The reversal of 2115565165109 is 9015615655112.

It can be written as a sum of positive squares in only one way, i.e., 1165762887025 + 949802278084 = 1079705^2 + 974578^2 .

It is not a de Polignac number, because 2115565165109 - 2¹⁶ = 2115565099573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115565165139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8742004694 + ... + 8742004935.

It is an arithmetic number, because the mean of its divisors is an integer number (387562213465).

Almost surely, 2^{2115565165109} is an apocalyptic number.

It is an amenable number.

2115565165109 is a deficient number, since it is larger than the sum of its proper divisors (209808115681).

2115565165109 is a wasteful number, since it uses less digits than its factorization.

2115565165109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17484009651 (or 17484009640 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 47.

The spelling of 2115565165109 in words is "two trillion, one hundred fifteen billion, five hundred sixty-five million, one hundred sixty-five thousand, one hundred nine".