215516255 has 16 divisors (see below), whose sum is σ = 269269920. Its totient is φ = 165389952.

The previous prime is 215516243. The next prime is 215516261. The reversal of 215516255 is 552615512.

215516255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 215516255 - 2¹⁰ = 215515231 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18032 + ... + 27498.

It is an arithmetic number, because the mean of its divisors is an integer number (16829370).

Almost surely, 2^215516255 is an apocalyptic number.

215516255 is a deficient number, since it is larger than the sum of its proper divisors (53753665).

215516255 is a wasteful number, since it uses less digits than its factorization.

215516255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9658.

The product of its digits is 15000, while the sum is 32.

The square root of 215516255 is about 14680.4718929604. The cubic root of 215516255 is about 599.5517531710.

The spelling of 215516255 in words is "two hundred fifteen million, five hundred sixteen thousand, two hundred fifty-five".