204785663557 has 8 divisors (see below), whose sum is σ = 211666568960. Its totient is φ = 197921940480.

The previous prime is 204785663543. The next prime is 204785663573. The reversal of 204785663557 is 755366587402.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204785663557 is a prime.

It is the 452533-rd Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204785663597) by changing a digit.

It is a nontrivial repunit in base 452532.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4271343 + ... + 4319020.

It is an arithmetic number, because the mean of its divisors is an integer number (26458321120).

Almost surely, 2^204785663557 is an apocalyptic number.

It is an amenable number.

204785663557 is a deficient number, since it is larger than the sum of its proper divisors (6880905403).

204785663557 is an equidigital number, since it uses as much as digits as its factorization.

204785663557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591163.

The product of its (nonzero) digits is 42336000, while the sum is 58.

The spelling of 204785663557 in words is "two hundred four billion, seven hundred eighty-five million, six hundred sixty-three thousand, five hundred fifty-seven".