216434555 has 4 divisors (see below), whose sum is σ = 259721472. Its totient is φ = 173147640.

The previous prime is 216434549. The next prime is 216434557. The reversal of 216434555 is 555434612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 216434555 - 2¹⁴ = 216418171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216434557) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21643451 + ... + 21643460.

It is an arithmetic number, because the mean of its divisors is an integer number (64930368).

Almost surely, 2^216434555 is an apocalyptic number.

216434555 is a deficient number, since it is larger than the sum of its proper divisors (43286917).

216434555 is an equidigital number, since it uses as much as digits as its factorization.

216434555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43286916.

The product of its digits is 72000, while the sum is 35.

The square root of 216434555 is about 14711.7148898420. The cubic root of 216434555 is about 600.4020962116.

The spelling of 216434555 in words is "two hundred sixteen million, four hundred thirty-four thousand, five hundred fifty-five".