216855873555 has 16 divisors (see below), whose sum is σ = 349047062784. Its totient is φ = 114963910880.

The previous prime is 216855873517. The next prime is 216855873599. The reversal of 216855873555 is 555378558612.

It is not a de Polignac number, because 216855873555 - 2¹⁵ = 216855840787 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 43282101 + ... + 43287110.

It is an arithmetic number, because the mean of its divisors is an integer number (21815441424).

Almost surely, 2^216855873555 is an apocalyptic number.

216855873555 is a deficient number, since it is larger than the sum of its proper divisors (132191189229).

216855873555 is a wasteful number, since it uses less digits than its factorization.

216855873555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86569386.

The product of its digits is 50400000, while the sum is 60.

The spelling of 216855873555 in words is "two hundred sixteen billion, eight hundred fifty-five million, eight hundred seventy-three thousand, five hundred fifty-five".