206215111017107 has 4 divisors (see below), whose sum is σ = 206216734412256. Its totient is φ = 206213487621960.

The previous prime is 206215111017067. The next prime is 206215111017143. The reversal of 206215111017107 is 701710111512602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206215111017107 - 2²⁶ = 206215043908243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206215111017907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 811507019 + ... + 811761092.

It is an arithmetic number, because the mean of its divisors is an integer number (51554183603064).

Almost surely, 2^{206215111017107} is an apocalyptic number.

206215111017107 is a deficient number, since it is larger than the sum of its proper divisors (1623395149).

206215111017107 is a wasteful number, since it uses less digits than its factorization.

206215111017107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623395148.

The product of its (nonzero) digits is 5880, while the sum is 35.

Adding to 206215111017107 its reverse (701710111512602), we get a palindrome (907925222529709).

The spelling of 206215111017107 in words is "two hundred six trillion, two hundred fifteen billion, one hundred eleven million, seventeen thousand, one hundred seven".