216955515 has 32 divisors (see below), whose sum is σ = 409522176. Its totient is φ = 95978880.

The previous prime is 216955493. The next prime is 216955523. The reversal of 216955515 is 515559612.

It is not a de Polignac number, because 216955515 - 2⁵ = 216955483 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30072 + ... + 36581.

It is an arithmetic number, because the mean of its divisors is an integer number (12797568).

Almost surely, 2^216955515 is an apocalyptic number.

216955515 is a deficient number, since it is larger than the sum of its proper divisors (192566661).

216955515 is a wasteful number, since it uses less digits than its factorization.

216955515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66699.

The product of its digits is 67500, while the sum is 39.

The square root of 216955515 is about 14729.4098659790. The cubic root of 216955515 is about 600.8834347112.

It can be divided in two parts, 216955 and 515, that added together give a triangular number (217470 = T₆₅₉).

The spelling of 216955515 in words is "two hundred sixteen million, nine hundred fifty-five thousand, five hundred fifteen".