216853505 has 16 divisors (see below), whose sum is σ = 284370048. Its totient is φ = 157440000.

The previous prime is 216853501. The next prime is 216853523. The reversal of 216853505 is 505358612.

It is not a de Polignac number, because 216853505 - 2² = 216853501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216853501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32180 + ... + 38330.

It is an arithmetic number, because the mean of its divisors is an integer number (17773128).

Almost surely, 2^216853505 is an apocalyptic number.

It is an amenable number.

216853505 is a deficient number, since it is larger than the sum of its proper divisors (67516543).

216853505 is a wasteful number, since it uses less digits than its factorization.

216853505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6808.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 216853505 is about 14725.9466588739. The cubic root of 216853505 is about 600.7892437760.

The spelling of 216853505 in words is "two hundred sixteen million, eight hundred fifty-three thousand, five hundred five".