1805803815204 has 81 divisors (see below), whose sum is σ = 4728113077233. Its totient is φ = 581102986464.

The previous prime is 1805803815191. The next prime is 1805803815239. The reversal of 1805803815204 is 4025183085081.

The square root of 1805803815204 is 1343802.

It is a perfect power (a square), and thus also a powerful number.

1805803815204 is a `hidden beast` number, since 1 + 8 + 0 + 580 + 38 + 15 + 20 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 946919717604 + 858884097600 = 973098^2 + 926760^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1805803815204.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 233817687 + ... + 233825409.

Almost surely, 2^{1805803815204} is an apocalyptic number.

1805803815204 is the 1343802-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1805803815204

1805803815204 is an abundant number, since it is smaller than the sum of its proper divisors (2922309262029).

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

1805803815204 is an frugal number, since it uses more digits than its factorization.

1805803815204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15514 (or 7757 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The spelling of 1805803815204 in words is "one trillion, eight hundred five billion, eight hundred three million, eight hundred fifteen thousand, two hundred four".