205870192217 has 4 divisors (see below), whose sum is σ = 205894310160. Its totient is φ = 205846074276.

The previous prime is 205870192201. The next prime is 205870192247. The reversal of 205870192217 is 712291078502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205870192217 - 2⁴ = 205870192201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205870192247) 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, 12046163 + ... + 12063240.

It is an arithmetic number, because the mean of its divisors is an integer number (51473577540).

Almost surely, 2^205870192217 is an apocalyptic number.

It is an amenable number.

205870192217 is a deficient number, since it is larger than the sum of its proper divisors (24117943).

205870192217 is an equidigital number, since it uses as much as digits as its factorization.

205870192217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24117942.

The product of its (nonzero) digits is 141120, while the sum is 44.

The spelling of 205870192217 in words is "two hundred five billion, eight hundred seventy million, one hundred ninety-two thousand, two hundred seventeen".