1781817845004 has 144 divisors (see below), whose sum is σ = 4781991614400. Its totient is φ = 557479231488.

The previous prime is 1781817844991. The next prime is 1781817845033. The reversal of 1781817845004 is 4005487181871.

1781817845004 is a `hidden beast` number, since 1 + 7 + 8 + 18 + 178 + 450 + 0 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 390148329 + ... + 390152895.

It is an arithmetic number, because the mean of its divisors is an integer number (33208275100).

Almost surely, 2^{1781817845004} 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 1781817845004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2390995807200).

1781817845004 is an abundant number, since it is smaller than the sum of its proper divisors (3000173769396).

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

1781817845004 is a wasteful number, since it uses less digits than its factorization.

1781817845004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6192 (or 6187 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 54.

The spelling of 1781817845004 in words is "one trillion, seven hundred eighty-one billion, eight hundred seventeen million, eight hundred forty-five thousand, four".