2118772809 has 10 divisors (see below), whose sum is σ = 3165080490. Its totient is φ = 1412515152.

The previous prime is 2118772801. The next prime is 2118772823. The reversal of 2118772809 is 9082778112.

It can be written as a sum of positive squares in only one way, i.e., 1145145600 + 973627209 = 33840^2 + 31203^2 .

It is not a de Polignac number, because 2118772809 - 2³ = 2118772801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2118772801) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13078764 + ... + 13078925.

It is an arithmetic number, because the mean of its divisors is an integer number (316508049).

Almost surely, 2^2118772809 is an apocalyptic number.

It is an amenable number.

2118772809 is a deficient number, since it is larger than the sum of its proper divisors (1046307681).

2118772809 is an equidigital number, since it uses as much as digits as its factorization.

2118772809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26157701 (or 26157692 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 2118772809 is about 46030.1293611043. The cubic root of 2118772809 is about 1284.3837343324.

The spelling of 2118772809 in words is "two billion, one hundred eighteen million, seven hundred seventy-two thousand, eight hundred nine".