206510116005 has 20 divisors (see below), whose sum is σ = 370188504972. Its totient is φ = 110138728320.

The previous prime is 206510116003. The next prime is 206510116009. The reversal of 206510116005 is 500611015602.

It is a happy number.

206510116005 is a `hidden beast` number, since 2 + 0 + 6 + 51 + 0 + 1 + 1 + 600 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 52595918244 + 153914197761 = 229338^2 + 392319^2 .

It is not a de Polignac number, because 206510116005 - 2¹ = 206510116003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 206510116005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206510116003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 254950356 + ... + 254951165.

Almost surely, 2^206510116005 is an apocalyptic number.

It is an amenable number.

206510116005 is a deficient number, since it is larger than the sum of its proper divisors (163678388967).

206510116005 is an equidigital number, since it uses as much as digits as its factorization.

206510116005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509901538 (or 509901529 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The spelling of 206510116005 in words is "two hundred six billion, five hundred ten million, one hundred sixteen thousand, five".