206195585217 has 16 divisors (see below), whose sum is σ = 280907792640. Its totient is φ = 134476276352.

The previous prime is 206195585213. The next prime is 206195585249. The reversal of 206195585217 is 712585591602.

It is a cyclic number.

It is not a de Polignac number, because 206195585217 - 2² = 206195585213 is a prime.

It is a super-2 number, since 2×206195585217² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206195585217.

It is not an unprimeable number, because it can be changed into a prime (206195585213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36042 + ... + 643187.

It is an arithmetic number, because the mean of its divisors is an integer number (17556737040).

Almost surely, 2^206195585217 is an apocalyptic number.

It is an amenable number.

206195585217 is a deficient number, since it is larger than the sum of its proper divisors (74712207423).

206195585217 is a wasteful number, since it uses less digits than its factorization.

206195585217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681432.

The product of its (nonzero) digits is 1512000, while the sum is 51.

The spelling of 206195585217 in words is "two hundred six billion, one hundred ninety-five million, five hundred eighty-five thousand, two hundred seventeen".