216668777031198 has 16 divisors (see below), whose sum is σ = 481486171180560. Its totient is φ = 72222925677048.

The previous prime is 216668777031167. The next prime is 216668777031199. The reversal of 216668777031198 is 891130777866612.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216668777031199) 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 7 ways as a sum of consecutive naturals, for example, 2006192379865 + ... + 2006192379972.

It is an arithmetic number, because the mean of its divisors is an integer number (30092885698785).

Almost surely, 2^{216668777031198} is an apocalyptic number.

216668777031198 is an abundant number, since it is smaller than the sum of its proper divisors (264817394149362).

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

216668777031198 is a wasteful number, since it uses less digits than its factorization.

216668777031198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012384759848 (or 4012384759842 counting only the distinct ones).

The product of its (nonzero) digits is 256048128, while the sum is 72.

The spelling of 216668777031198 in words is "two hundred sixteen trillion, six hundred sixty-eight billion, seven hundred seventy-seven million, thirty-one thousand, one hundred ninety-eight".