1813982909664 has 48 divisors (see below), whose sum is σ = 4925901874320. Its totient is φ = 583810590720.

The previous prime is 1813982909659. The next prime is 1813982909671. The reversal of 1813982909664 is 4669092893181.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 1813982909595 and 1813982909604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325784377 + ... + 325789944.

It is an arithmetic number, because the mean of its divisors is an integer number (102622955715).

Almost surely, 2^{1813982909664} is an apocalyptic number.

It is an amenable number.

1813982909664 is an abundant number, since it is smaller than the sum of its proper divisors (3111918964656).

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

1813982909664 is a wasteful number, since it uses less digits than its factorization.

1813982909664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651574363 (or 651574355 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 66.

The spelling of 1813982909664 in words is "one trillion, eight hundred thirteen billion, nine hundred eighty-two million, nine hundred nine thousand, six hundred sixty-four".