216855518 has 16 divisors (see below), whose sum is σ = 355104000. Its totient is φ = 98501400.

The previous prime is 216855517. The next prime is 216855539. The reversal of 216855518 is 815558612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216855517) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 41513 + ... + 46443.

It is an arithmetic number, because the mean of its divisors is an integer number (22194000).

Almost surely, 2^216855518 is an apocalyptic number.

216855518 is a deficient number, since it is larger than the sum of its proper divisors (138248482).

216855518 is a wasteful number, since it uses less digits than its factorization.

216855518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6943.

The product of its digits is 96000, while the sum is 41.

The square root of 216855518 is about 14726.0150074621. The cubic root of 216855518 is about 600.7911027652.

The spelling of 216855518 in words is "two hundred sixteen million, eight hundred fifty-five thousand, five hundred eighteen".