216511345 has 8 divisors (see below), whose sum is σ = 260850240. Its totient is φ = 172518000.

The previous prime is 216511333. The next prime is 216511363. The reversal of 216511345 is 543115612.

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

It is not a de Polignac number, because 216511345 - 2⁵ = 216511313 is a prime.

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, 85005 + ... + 87514.

It is an arithmetic number, because the mean of its divisors is an integer number (32606280).

Almost surely, 2^216511345 is an apocalyptic number.

It is an amenable number.

216511345 is a deficient number, since it is larger than the sum of its proper divisors (44338895).

216511345 is a wasteful number, since it uses less digits than its factorization.

216511345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172775.

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

The square root of 216511345 is about 14714.3244833054. The cubic root of 216511345 is about 600.4730944639.

Adding to 216511345 its reverse (543115612), we get a palindrome (759626957).

The spelling of 216511345 in words is "two hundred sixteen million, five hundred eleven thousand, three hundred forty-five".