216555163 has 16 divisors (see below), whose sum is σ = 250854624. Its totient is φ = 184757760.

The previous prime is 216555149. The next prime is 216555169. The reversal of 216555163 is 361555612.

It is not a de Polignac number, because 216555163 - 2⁹ = 216554651 is a prime.

It is a super-2 number, since 2×216555163² = 93792277243913138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216555169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72781 + ... + 75697.

It is an arithmetic number, because the mean of its divisors is an integer number (15678414).

Almost surely, 2^216555163 is an apocalyptic number.

216555163 is a deficient number, since it is larger than the sum of its proper divisors (34299461).

216555163 is a wasteful number, since it uses less digits than its factorization.

216555163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342.

The product of its digits is 27000, while the sum is 34.

The square root of 216555163 is about 14715.8133652204. The cubic root of 216555163 is about 600.5136000477.

The spelling of 216555163 in words is "two hundred sixteen million, five hundred fifty-five thousand, one hundred sixty-three".