1808899518780 has 144 divisors (see below), whose sum is σ = 5698746353664. Its totient is φ = 463948663680.

The previous prime is 1808899518709. The next prime is 1808899518893. The reversal of 1808899518780 is 878159988081.

1808899518780 is a `hidden beast` number, since 18 + 0 + 8 + 8 + 99 + 518 + 7 + 8 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1808899518699 and 1808899518708.

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, 84864 + ... + 1903943.

It is an arithmetic number, because the mean of its divisors is an integer number (39574627456).

Almost surely, 2^{1808899518780} is an apocalyptic number.

1808899518780 is a gapful number since it is divisible by the number (10) 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 1808899518780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2849373176832).

1808899518780 is an abundant number, since it is smaller than the sum of its proper divisors (3889846834884).

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

1808899518780 is a wasteful number, since it uses less digits than its factorization.

1808899518780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989016 (or 1989011 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 72.

The spelling of 1808899518780 in words is "one trillion, eight hundred eight billion, eight hundred ninety-nine million, five hundred eighteen thousand, seven hundred eighty".