204112515516 has 144 divisors (see below), whose sum is σ = 609715008000. Its totient is φ = 51975495936.

The previous prime is 204112515493. The next prime is 204112515533. The reversal of 204112515516 is 615515211402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 163785 + ... + 659583.

It is an arithmetic number, because the mean of its divisors is an integer number (4234132000).

Almost surely, 2^204112515516 is an apocalyptic number.

204112515516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204112515516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304857504000).

204112515516 is an abundant number, since it is smaller than the sum of its proper divisors (405602492484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204112515516 is a wasteful number, since it uses less digits than its factorization.

204112515516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495868 (or 495853 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 33.

Adding to 204112515516 its reverse (615515211402), we get a palindrome (819627726918).

The spelling of 204112515516 in words is "two hundred four billion, one hundred twelve million, five hundred fifteen thousand, five hundred sixteen".