2186308177209 has 12 divisors (see below), whose sum is σ = 3400923831396. Its totient is φ = 1345420416672.

The previous prime is 2186308177139. The next prime is 2186308177211. The reversal of 2186308177209 is 9027718036812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 198673449984 + 1987634727225 = 445728^2 + 1409835^2 .

It is not a de Polignac number, because 2186308177209 - 2²⁷ = 2186173959481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2182308177209) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 9343197222 + ... + 9343197455.

It is an arithmetic number, because the mean of its divisors is an integer number (283410319283).

Almost surely, 2^{2186308177209} is an apocalyptic number.

It is an amenable number.

2186308177209 is a deficient number, since it is larger than the sum of its proper divisors (1214615654187).

2186308177209 is a wasteful number, since it uses less digits than its factorization.

2186308177209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18686394696 (or 18686394693 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 2186308177209 in words is "two trillion, one hundred eighty-six billion, three hundred eight million, one hundred seventy-seven thousand, two hundred nine".