216688320106 has 8 divisors (see below), whose sum is σ = 325103199300. Its totient is φ = 108320587008.

The previous prime is 216688320097. The next prime is 216688320119. The reversal of 216688320106 is 601023886612.

It can be written as a sum of positive squares in 2 ways, for example, as 153945584881 + 62742735225 = 392359^2 + 250485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11775031 + ... + 11793418.

Almost surely, 2^216688320106 is an apocalyptic number.

216688320106 is a deficient number, since it is larger than the sum of its proper divisors (108414879194).

216688320106 is a wasteful number, since it uses less digits than its factorization.

216688320106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23573048.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 216688320106 in words is "two hundred sixteen billion, six hundred eighty-eight million, three hundred twenty thousand, one hundred six".