216678655 has 8 divisors (see below), whose sum is σ = 261151200. Its totient is φ = 172585056.

The previous prime is 216678647. The next prime is 216678689. The reversal of 216678655 is 556876612.

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

It is a cyclic number.

It is not a de Polignac number, because 216678655 - 2³ = 216678647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93475 + ... + 95764.

It is an arithmetic number, because the mean of its divisors is an integer number (32643900).

Almost surely, 2^216678655 is an apocalyptic number.

216678655 is a deficient number, since it is larger than the sum of its proper divisors (44472545).

216678655 is a wasteful number, since it uses less digits than its factorization.

216678655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189473.

The product of its digits is 604800, while the sum is 46.

The square root of 216678655 is about 14720.0086616822. The cubic root of 216678655 is about 600.6277272943.

The spelling of 216678655 in words is "two hundred sixteen million, six hundred seventy-eight thousand, six hundred fifty-five".