216516678 has 16 divisors (see below), whose sum is σ = 494895360. Its totient is φ = 61861896.

The previous prime is 216516673. The next prime is 216516683. The reversal of 216516678 is 876615612.

216516678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216516673) and next prime (216516683).

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 5155159 = 216516678 / (2 + 1 + 6 + 5 + 1 + 6 + 6 + 7 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216516673) 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, 2577538 + ... + 2577621.

It is an arithmetic number, because the mean of its divisors is an integer number (30930960).

Almost surely, 2^216516678 is an apocalyptic number.

216516678 is an abundant number, since it is smaller than the sum of its proper divisors (278378682).

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

216516678 is a wasteful number, since it uses less digits than its factorization.

216516678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155171.

The product of its digits is 120960, while the sum is 42.

The square root of 216516678 is about 14714.5057001586. The cubic root of 216516678 is about 600.4780246085.

The spelling of 216516678 in words is "two hundred sixteen million, five hundred sixteen thousand, six hundred seventy-eight".