216833505 has 32 divisors (see below), whose sum is σ = 407218944. Its totient is φ = 96443136.

The previous prime is 216833501. The next prime is 216833531. The reversal of 216833505 is 505338612.

It is not a de Polignac number, because 216833505 - 2² = 216833501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216833501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24022 + ... + 31791.

It is an arithmetic number, because the mean of its divisors is an integer number (12725592).

Almost surely, 2^216833505 is an apocalyptic number.

It is an amenable number.

216833505 is a deficient number, since it is larger than the sum of its proper divisors (190385439).

216833505 is a wasteful number, since it uses less digits than its factorization.

216833505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55865.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 216833505 is about 14725.2675697252. The cubic root of 216833505 is about 600.7707733124.

The spelling of 216833505 in words is "two hundred sixteen million, eight hundred thirty-three thousand, five hundred five".