2178556080786 has 288 divisors, whose sum is σ = 5155804203264. Its totient is φ = 664082496000.

The previous prime is 2178556080749. The next prime is 2178556080787. The reversal of 2178556080786 is 6870806558712.

2178556080786 is a `hidden beast` number, since 2 + 1 + 7 + 8 + 556 + 0 + 8 + 0 + 78 + 6 = 666.

It is a super-2 number, since 2×2178556080786² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2178556080787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3530884750 + ... + 3530885366.

It is an arithmetic number, because the mean of its divisors is an integer number (17902097928).

Almost surely, 2^{2178556080786} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178556080786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2577902101632).

2178556080786 is an abundant number, since it is smaller than the sum of its proper divisors (2977248122478).

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

2178556080786 is a wasteful number, since it uses less digits than its factorization.

2178556080786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 45158400, while the sum is 63.

The spelling of 2178556080786 in words is "two trillion, one hundred seventy-eight billion, five hundred fifty-six million, eighty thousand, seven hundred eighty-six".