216528255999 has 72 divisors (see below), whose sum is σ = 362390409360. Its totient is φ = 127679872320.

The previous prime is 216528255997. The next prime is 216528256013. The reversal of 216528255999 is 999552825612.

216528255999 is a `hidden beast` number, since 2 + 16 + 5 + 2 + 8 + 25 + 599 + 9 = 666.

It is not a de Polignac number, because 216528255999 - 2¹ = 216528255997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216528255997) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4448317 + ... + 4496729.

It is an arithmetic number, because the mean of its divisors is an integer number (5033200130).

Almost surely, 2^216528255999 is an apocalyptic number.

216528255999 is a deficient number, since it is larger than the sum of its proper divisors (145862153361).

216528255999 is a wasteful number, since it uses less digits than its factorization.

216528255999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48518 (or 48464 counting only the distinct ones).

The product of its digits is 34992000, while the sum is 63.

The spelling of 216528255999 in words is "two hundred sixteen billion, five hundred twenty-eight million, two hundred fifty-five thousand, nine hundred ninety-nine".