1813653838464 has 64 divisors (see below), whose sum is σ = 5188096331040. Its totient is φ = 558047333376.

The previous prime is 1813653838463. The next prime is 1813653838511. The reversal of 1813653838464 is 4648383563181.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1813653838398 and 1813653838407.

It is not an unprimeable number, because it can be changed into a prime (1813653838463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181651042 + ... + 181661025.

Almost surely, 2^{1813653838464} is an apocalyptic number.

It is an amenable number.

1813653838464 is an abundant number, since it is smaller than the sum of its proper divisors (3374442492576).

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

1813653838464 is a wasteful number, since it uses less digits than its factorization.

1813653838464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363312097 (or 363312085 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 60.

The spelling of 1813653838464 in words is "one trillion, eight hundred thirteen billion, six hundred fifty-three million, eight hundred thirty-eight thousand, four hundred sixty-four".