2178840085416 has 96 divisors (see below), whose sum is σ = 6252351431040. Its totient is φ = 683097414144.

The previous prime is 2178840085391. The next prime is 2178840085427. The reversal of 2178840085416 is 6145800488712.

2178840085416 is a `hidden beast` number, since 2 + 1 + 78 + 84 + 0 + 0 + 85 + 416 = 666.

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, 1221535 + ... + 2418641.

It is an arithmetic number, because the mean of its divisors is an integer number (65128660740).

Almost surely, 2^{2178840085416} 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 2178840085416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3126175715520).

2178840085416 is an abundant number, since it is smaller than the sum of its proper divisors (4073511345624).

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

2178840085416 is a wasteful number, since it uses less digits than its factorization.

2178840085416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198623 (or 1198616 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 2178840085416 in words is "two trillion, one hundred seventy-eight billion, eight hundred forty million, eighty-five thousand, four hundred sixteen".