216980518 has 4 divisors (see below), whose sum is σ = 325470780. Its totient is φ = 108490258.

The previous prime is 216980497. The next prime is 216980567. The reversal of 216980518 is 815089612.

216980518 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54245128 + ... + 54245131.

It is an arithmetic number, because the mean of its divisors is an integer number (81367695).

Almost surely, 2^216980518 is an apocalyptic number.

216980518 is a deficient number, since it is larger than the sum of its proper divisors (108490262).

216980518 is a wasteful number, since it uses less digits than its factorization.

216980518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108490261.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 216980518 is about 14730.2585856461. The cubic root of 216980518 is about 600.9065167263.

The spelling of 216980518 in words is "two hundred sixteen million, nine hundred eighty thousand, five hundred eighteen".