1813031944464 has 160 divisors (see below), whose sum is σ = 5097799942144. Its totient is φ = 551910412800.

The previous prime is 1813031944463. The next prime is 1813031944483. The reversal of 1813031944464 is 4644491303181.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1813031944463) 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, 69850689 + ... + 69876639.

Almost surely, 2^{1813031944464} 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 1813031944464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2548899971072).

1813031944464 is an abundant number, since it is smaller than the sum of its proper divisors (3284767997680).

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

1813031944464 is a wasteful number, since it uses less digits than its factorization.

1813031944464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27165 (or 27159 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The spelling of 1813031944464 in words is "one trillion, eight hundred thirteen billion, thirty-one million, nine hundred forty-four thousand, four hundred sixty-four".