1817478684672 has 336 divisors, whose sum is σ = 5648213302992. Its totient is φ = 518298009600.

The previous prime is 1817478684667. The next prime is 1817478684743. The reversal of 1817478684672 is 2764868747181.

It is a tau number, because it is divible by the number of its divisors (336).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1817478684597 and 1817478684606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 844159948 + ... + 844162100.

Almost surely, 2^{1817478684672} is an apocalyptic number.

1817478684672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1817478684672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2824106651496).

1817478684672 is an abundant number, since it is smaller than the sum of its proper divisors (3830734618320).

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

1817478684672 is an equidigital number, since it uses as much as digits as its factorization.

1817478684672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897 (or 2866 counting only the distinct ones).

The product of its digits is 202309632, while the sum is 69.

The spelling of 1817478684672 in words is "one trillion, eight hundred seventeen billion, four hundred seventy-eight million, six hundred eighty-four thousand, six hundred seventy-two".