205579030117 has 8 divisors (see below), whose sum is σ = 213129294840. Its totient is φ = 198059520960.

The previous prime is 205579030109. The next prime is 205579030121. The reversal of 205579030117 is 711030975502.

It can be written as a sum of positive squares in 4 ways, for example, as 78123604036 + 127455426081 = 279506^2 + 357009^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 205579030117 - 2³ = 205579030109 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 205579030117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205579030177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7675278 + ... + 7702015.

It is an arithmetic number, because the mean of its divisors is an integer number (26641161855).

Almost surely, 2^205579030117 is an apocalyptic number.

It is an amenable number.

205579030117 is a deficient number, since it is larger than the sum of its proper divisors (7550264723).

205579030117 is a wasteful number, since it uses less digits than its factorization.

205579030117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15377783.

The product of its (nonzero) digits is 66150, while the sum is 40.

The spelling of 205579030117 in words is "two hundred five billion, five hundred seventy-nine million, thirty thousand, one hundred seventeen".