1813081778116 has 48 divisors (see below), whose sum is σ = 3647573403264. Its totient is φ = 772448334336.

The previous prime is 1813081778113. The next prime is 1813081778149. The reversal of 1813081778116 is 6118771803181.

It is not an unprimeable number, because it can be changed into a prime (1813081778113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50907171 + ... + 50942773.

It is an arithmetic number, because the mean of its divisors is an integer number (75991112568).

Almost surely, 2^{1813081778116} is an apocalyptic number.

It is an amenable number.

1813081778116 is an abundant number, since it is smaller than the sum of its proper divisors (1834491625148).

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

1813081778116 is a wasteful number, since it uses less digits than its factorization.

1813081778116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46300 (or 46298 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 52.

The spelling of 1813081778116 in words is "one trillion, eight hundred thirteen billion, eighty-one million, seven hundred seventy-eight thousand, one hundred sixteen".