204557934617 has 18 divisors (see below), whose sum is σ = 208460216574. Its totient is φ = 200712919680.

The previous prime is 204557934587. The next prime is 204557934629. The reversal of 204557934617 is 716439755402.

It can be written as a sum of positive squares in 3 ways, for example, as 4372383376 + 200185551241 = 66124^2 + 447421^2 .

It is not a de Polignac number, because 204557934617 - 2¹⁴ = 204557918233 is a prime.

It is a super-2 number, since 2×204557934617² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204557934667) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 754826192 + ... + 754826462.

It is an arithmetic number, because the mean of its divisors is an integer number (11581123143).

Almost surely, 2^204557934617 is an apocalyptic number.

It is an amenable number.

204557934617 is a deficient number, since it is larger than the sum of its proper divisors (3902281957).

204557934617 is an frugal number, since it uses more digits than its factorization.

204557934617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 204557934617 in words is "two hundred four billion, five hundred fifty-seven million, nine hundred thirty-four thousand, six hundred seventeen".