216617788458 has 16 divisors (see below), whose sum is σ = 481372863360. Its totient is φ = 72205929468.

The previous prime is 216617788423. The next prime is 216617788483. The reversal of 216617788458 is 854887716612.

It is a happy number.

216617788458 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 177 + 8 + 8 + 458 = 666.

216617788458 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 = 216617788395 and 216617788404.

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, 2005720210 + ... + 2005720317.

It is an arithmetic number, because the mean of its divisors is an integer number (30085803960).

Almost surely, 2^216617788458 is an apocalyptic number.

216617788458 is an abundant number, since it is smaller than the sum of its proper divisors (264755074902).

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

216617788458 is a wasteful number, since it uses less digits than its factorization.

216617788458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4011440538 (or 4011440532 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 63.

The spelling of 216617788458 in words is "two hundred sixteen billion, six hundred seventeen million, seven hundred eighty-eight thousand, four hundred fifty-eight".