1800816516 has 48 divisors (see below), whose sum is σ = 4675070400. Its totient is φ = 599463936.

The previous prime is 1800816503. The next prime is 1800816559. The reversal of 1800816516 is 6156180081.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72211 + ... + 93893.

It is an arithmetic number, because the mean of its divisors is an integer number (97397300).

Almost surely, 2^1800816516 is an apocalyptic number.

It is an amenable number.

1800816516 is an abundant number, since it is smaller than the sum of its proper divisors (2874253884).

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

1800816516 is a wasteful number, since it uses less digits than its factorization.

1800816516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22465 (or 22457 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 1800816516 is about 42436.0285135167. The cubic root of 1800816516 is about 1216.6243052076.

Adding to 1800816516 its reverse (6156180081), we get a palindrome (7956996597).

The spelling of 1800816516 in words is "one billion, eight hundred million, eight hundred sixteen thousand, five hundred sixteen".