215878979168 has 48 divisors (see below), whose sum is σ = 434974478400. Its totient is φ = 105410180736.

The previous prime is 215878979167. The next prime is 215878979189. The reversal of 215878979168 is 861979878512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215878979161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10319183 + ... + 10340081.

It is an arithmetic number, because the mean of its divisors is an integer number (9061968300).

Almost surely, 2^215878979168 is an apocalyptic number.

It is an amenable number.

215878979168 is an abundant number, since it is smaller than the sum of its proper divisors (219095499232).

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

215878979168 is a wasteful number, since it uses less digits than its factorization.

215878979168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28459 (or 28451 counting only the distinct ones).

The product of its digits is 121927680, while the sum is 71.

The spelling of 215878979168 in words is "two hundred fifteen billion, eight hundred seventy-eight million, nine hundred seventy-nine thousand, one hundred sixty-eight".