216552555 has 16 divisors (see below), whose sum is σ = 384982560. Its totient is φ = 115494624.

The previous prime is 216552503. The next prime is 216552559. The reversal of 216552555 is 555255612.

216552555 is a `hidden beast` number, since 21 + 65 + 525 + 55 = 666.

216552555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216552555 - 2⁸ = 216552299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216552559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801912 + ... + 802181.

It is an arithmetic number, because the mean of its divisors is an integer number (24061410).

Almost surely, 2^216552555 is an apocalyptic number.

216552555 is a deficient number, since it is larger than the sum of its proper divisors (168430005).

216552555 is a wasteful number, since it uses less digits than its factorization.

216552555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604107 (or 1604101 counting only the distinct ones).

The product of its digits is 75000, while the sum is 36.

The square root of 216552555 is about 14715.7247527942. The cubic root of 216552555 is about 600.5111893521.

The spelling of 216552555 in words is "two hundred sixteen million, five hundred fifty-two thousand, five hundred fifty-five".