1813516274544 has 160 divisors (see below), whose sum is σ = 5317413830400. Its totient is φ = 527981690880.

The previous prime is 1813516274543. The next prime is 1813516274621. The reversal of 1813516274544 is 4454726153181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813516274543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9520912 + ... + 9709520.

It is an arithmetic number, because the mean of its divisors is an integer number (33233836440).

Almost surely, 2^{1813516274544} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1813516274544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2658706915200).

1813516274544 is an abundant number, since it is smaller than the sum of its proper divisors (3503897555856).

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

1813516274544 is a wasteful number, since it uses less digits than its factorization.

1813516274544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189463 (or 189457 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 51.

The spelling of 1813516274544 in words is "one trillion, eight hundred thirteen billion, five hundred sixteen million, two hundred seventy-four thousand, five hundred forty-four".