216515505 has 16 divisors (see below), whose sum is σ = 346883904. Its totient is φ = 115321920.

The previous prime is 216515503. The next prime is 216515513. The reversal of 216515505 is 505515612.

It is not a de Polignac number, because 216515505 - 2¹ = 216515503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216515503) 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, 2635 + ... + 20975.

It is an arithmetic number, because the mean of its divisors is an integer number (21680244).

Almost surely, 2^216515505 is an apocalyptic number.

It is an amenable number.

216515505 is a deficient number, since it is larger than the sum of its proper divisors (130368399).

216515505 is a wasteful number, since it uses less digits than its factorization.

216515505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19136.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 216515505 is about 14714.4658414772. The cubic root of 216515505 is about 600.4769402240.

The spelling of 216515505 in words is "two hundred sixteen million, five hundred fifteen thousand, five hundred five".