216155515 has 8 divisors (see below), whose sum is σ = 261811440. Its totient is φ = 171307872.

The previous prime is 216155483. The next prime is 216155521. The reversal of 216155515 is 515551612.

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

It is a cyclic number.

It is not a de Polignac number, because 216155515 - 2⁵ = 216155483 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201480 + ... + 202549.

It is an arithmetic number, because the mean of its divisors is an integer number (32726430).

Almost surely, 2^216155515 is an apocalyptic number.

216155515 is a deficient number, since it is larger than the sum of its proper divisors (45655925).

216155515 is a wasteful number, since it uses less digits than its factorization.

216155515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404141.

The product of its digits is 7500, while the sum is 31.

The square root of 216155515 is about 14702.2282324823. The cubic root of 216155515 is about 600.1439608264.

The spelling of 216155515 in words is "two hundred sixteen million, one hundred fifty-five thousand, five hundred fifteen".