2180868869 has 2 divisors, whose sum is σ = 2180868870. Its totient is φ = 2180868868.

The previous prime is 2180868821. The next prime is 2180868931. The reversal of 2180868869 is 9688680812.

2180868869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1941547969 + 239320900 = 44063^2 + 15470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2180868869 is a prime.

It is a super-2 number, since 2×2180868869² = 9512378047546678322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2180861869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090434434 + 1090434435.

It is an arithmetic number, because the mean of its divisors is an integer number (1090434435).

Almost surely, 2^2180868869 is an apocalyptic number.

It is an amenable number.

2180868869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180868869 is an equidigital number, since it uses as much as digits as its factorization.

2180868869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2654208, while the sum is 56.

The square root of 2180868869 is about 46699.7737574820. The cubic root of 2180868869 is about 1296.8104984335.

The spelling of 2180868869 in words is "two billion, one hundred eighty million, eight hundred sixty-eight thousand, eight hundred sixty-nine".