216545515 has 16 divisors (see below), whose sum is σ = 263723040. Its totient is φ = 170675200.

The previous prime is 216545503. The next prime is 216545533. The reversal of 216545515 is 515545612.

It is not a de Polignac number, because 216545515 - 2²¹ = 214448363 is a prime.

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, 113691 + ... + 115579.

It is an arithmetic number, because the mean of its divisors is an integer number (16482690).

Almost surely, 2^216545515 is an apocalyptic number.

216545515 is a deficient number, since it is larger than the sum of its proper divisors (47177525).

216545515 is a wasteful number, since it uses less digits than its factorization.

216545515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222.

The product of its digits is 30000, while the sum is 34.

The square root of 216545515 is about 14715.4855509426. The cubic root of 216545515 is about 600.5046818562.

The spelling of 216545515 in words is "two hundred sixteen million, five hundred forty-five thousand, five hundred fifteen".