2178522085516 has 24 divisors (see below), whose sum is σ = 4366748080800. Its totient is φ = 931572913152.

The previous prime is 2178522085513. The next prime is 2178522085559. The reversal of 2178522085516 is 6155802258712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2178522085513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86629255 + ... + 86654398.

It is an arithmetic number, because the mean of its divisors is an integer number (181947836700).

Almost surely, 2^{2178522085516} is an apocalyptic number.

It is an amenable number.

2178522085516 is an abundant number, since it is smaller than the sum of its proper divisors (2188225995284).

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

2178522085516 is a wasteful number, since it uses less digits than its factorization.

2178522085516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173284113 (or 173284111 counting only the distinct ones).

The product of its (nonzero) digits is 2688000, while the sum is 52.

The spelling of 2178522085516 in words is "two trillion, one hundred seventy-eight billion, five hundred twenty-two million, eighty-five thousand, five hundred sixteen".