216120655 has 8 divisors (see below), whose sum is σ = 259759584. Its totient is φ = 172620000.

The previous prime is 216120647. The next prime is 216120679. The reversal of 216120655 is 556021612.

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

It is not a de Polignac number, because 216120655 - 2³ = 216120647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31096 + ... + 37405.

It is an arithmetic number, because the mean of its divisors is an integer number (32469948).

Almost surely, 2^216120655 is an apocalyptic number.

216120655 is a deficient number, since it is larger than the sum of its proper divisors (43638929).

216120655 is an equidigital number, since it uses as much as digits as its factorization.

216120655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69137.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 216120655 is about 14701.0426500980. The cubic root of 216120655 is about 600.1116967977. Note that the first 3 decimals are identical.

It can be divided in two parts, 21 and 6120655, that added together give a square (6120676 = 2474²).

The spelling of 216120655 in words is "two hundred sixteen million, one hundred twenty thousand, six hundred fifty-five".