216771878568 has 32 divisors (see below), whose sum is σ = 619348224960. Its totient is φ = 61934822400.

The previous prime is 216771878513. The next prime is 216771878581. The reversal of 216771878568 is 865878177612.

216771878568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 216771878499 and 216771878508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645154233 + ... + 645154568.

It is an arithmetic number, because the mean of its divisors is an integer number (19354632030).

Almost surely, 2^216771878568 is an apocalyptic number.

216771878568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216771878568 is an abundant number, since it is smaller than the sum of its proper divisors (402576346392).

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

216771878568 is a wasteful number, since it uses less digits than its factorization.

216771878568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290308817 (or 1290308813 counting only the distinct ones).

The product of its digits is 63221760, while the sum is 66.

The spelling of 216771878568 in words is "two hundred sixteen billion, seven hundred seventy-one million, eight hundred seventy-eight thousand, five hundred sixty-eight".