2378817561816 has 96 divisors (see below), whose sum is σ = 6520936181760. Its totient is φ = 783303619776.

The previous prime is 2378817561751. The next prime is 2378817561859. The reversal of 2378817561816 is 6181657188732.

2378817561816 is a `hidden beast` number, since 2 + 3 + 7 + 8 + 8 + 1 + 7 + 5 + 618 + 1 + 6 = 666.

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, 88329745 + ... + 88356671.

It is an arithmetic number, because the mean of its divisors is an integer number (67926418560).

Almost surely, 2^{2378817561816} 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 2378817561816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3260468090880).

2378817561816 is an abundant number, since it is smaller than the sum of its proper divisors (4142118619944).

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

2378817561816 is a wasteful number, since it uses less digits than its factorization.

2378817561816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41805 (or 41798 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 63.

The spelling of 2378817561816 in words is "two trillion, three hundred seventy-eight billion, eight hundred seventeen million, five hundred sixty-one thousand, eight hundred sixteen".