216215655 has 8 divisors (see below), whose sum is σ = 345945072. Its totient is φ = 115315008.

The previous prime is 216215627. The next prime is 216215717. The reversal of 216215655 is 556512612.

216215655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 216215655 - 2⁸ = 216215399 is a prime.

It is a zygodrome in base 2.

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, 7207174 + ... + 7207203.

It is an arithmetic number, because the mean of its divisors is an integer number (43243134).

Almost surely, 2^216215655 is an apocalyptic number.

216215655 is a deficient number, since it is larger than the sum of its proper divisors (129729417).

216215655 is a wasteful number, since it uses less digits than its factorization.

216215655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14414385.

The product of its digits is 18000, while the sum is 33.

The square root of 216215655 is about 14704.2733584492. The cubic root of 216215655 is about 600.1996141385.

The spelling of 216215655 in words is "two hundred sixteen million, two hundred fifteen thousand, six hundred fifty-five".