211808755756789 has 2 divisors, whose sum is σ = 211808755756790. Its totient is φ = 211808755756788.

The previous prime is 211808755756771. The next prime is 211808755756813. The reversal of 211808755756789 is 987657557808112.

211808755756789 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., 195544005527025 + 16264750229764 = 13983705^2 + 4032958^2 .

It is a cyclic number.

It is not a de Polignac number, because 211808755756789 - 2²⁷ = 211808621539061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211808755756709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105904377878394 + 105904377878395.

It is an arithmetic number, because the mean of its divisors is an integer number (105904377878395).

Almost surely, 2^{211808755756789} is an apocalyptic number.

It is an amenable number.

211808755756789 is a deficient number, since it is larger than the sum of its proper divisors (1).

211808755756789 is an equidigital number, since it uses as much as digits as its factorization.

211808755756789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816000, while the sum is 79.

The spelling of 211808755756789 in words is "two hundred eleven trillion, eight hundred eight billion, seven hundred fifty-five million, seven hundred fifty-six thousand, seven hundred eighty-nine".