205561198 has 8 divisors (see below), whose sum is σ = 308409192. Its totient is φ = 102758136.

The previous prime is 205561183. The next prime is 205561201. The reversal of 205561198 is 891165502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×205561198² = 84510812246390408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4761 + ... + 20827.

It is an arithmetic number, because the mean of its divisors is an integer number (38551149).

Almost surely, 2^205561198 is an apocalyptic number.

205561198 is a deficient number, since it is larger than the sum of its proper divisors (102847994).

205561198 is a wasteful number, since it uses less digits than its factorization.

205561198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22466.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 205561198 is about 14337.4055533071. The cubic root of 205561198 is about 590.1744174555.

The spelling of 205561198 in words is "two hundred five million, five hundred sixty-one thousand, one hundred ninety-eight".