206144093889 has 24 divisors (see below), whose sum is σ = 313270192872. Its totient is φ = 130453735680.

The previous prime is 206144093861. The next prime is 206144093891. The reversal of 206144093889 is 988390441602.

206144093889 is a `hidden beast` number, since 206 + 14 + 40 + 9 + 388 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 421070400 + 205723023489 = 20520^2 + 453567^2 .

It is not a de Polignac number, because 206144093889 - 2²⁴ = 206127316673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206144093819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7535754 + ... + 7563059.

It is an arithmetic number, because the mean of its divisors is an integer number (13052924703).

Almost surely, 2^206144093889 is an apocalyptic number.

It is an amenable number.

206144093889 is a deficient number, since it is larger than the sum of its proper divisors (107126098983).

206144093889 is a wasteful number, since it uses less digits than its factorization.

206144093889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15098897 (or 15098894 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 206144093889 in words is "two hundred six billion, one hundred forty-four million, ninety-three thousand, eight hundred eighty-nine".