204658935652661 has 16 divisors (see below), whose sum is σ = 238362455683584. Its totient is φ = 172073531220864.

The previous prime is 204658935652649. The next prime is 204658935652681. The reversal of 204658935652661 is 166256539856402.

204658935652661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-204658935652661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204658935652591 and 204658935652600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204658935652681) 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, 60145856 + ... + 63457401.

It is an arithmetic number, because the mean of its divisors is an integer number (14897653480224).

Almost surely, 2^{204658935652661} is an apocalyptic number.

It is an amenable number.

204658935652661 is a deficient number, since it is larger than the sum of its proper divisors (33703520030923).

204658935652661 is a wasteful number, since it uses less digits than its factorization.

204658935652661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123607780.

The product of its (nonzero) digits is 559872000, while the sum is 68.

The spelling of 204658935652661 in words is "two hundred four trillion, six hundred fifty-eight billion, nine hundred thirty-five million, six hundred fifty-two thousand, six hundred sixty-one".