206505515161 has 32 divisors (see below), whose sum is σ = 235689209856. Its totient is φ = 179233560000.

The previous prime is 206505515159. The next prime is 206505515173. The reversal of 206505515161 is 161515505602.

It is not a de Polignac number, because 206505515161 - 2¹ = 206505515159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206505515161.

It is not an unprimeable number, because it can be changed into a prime (206505515191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9736210 + ... + 9757396.

It is an arithmetic number, because the mean of its divisors is an integer number (7365287808).

Almost surely, 2^206505515161 is an apocalyptic number.

It is an amenable number.

206505515161 is a deficient number, since it is larger than the sum of its proper divisors (29183694695).

206505515161 is a wasteful number, since it uses less digits than its factorization.

206505515161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21613.

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 206505515161 in words is "two hundred six billion, five hundred five million, five hundred fifteen thousand, one hundred sixty-one".