216875655 has 24 divisors (see below), whose sum is σ = 376451712. Its totient is φ = 115502784.

The previous prime is 216875653. The next prime is 216875663. The reversal of 216875655 is 556578612.

216875655 is a `hidden beast` number, since 2 + 1 + 6 + 87 + 565 + 5 = 666.

216875655 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 216875655 - 2¹ = 216875653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 216875655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216875653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32842 + ... + 38888.

It is an arithmetic number, because the mean of its divisors is an integer number (15685488).

Almost surely, 2^216875655 is an apocalyptic number.

216875655 is a deficient number, since it is larger than the sum of its proper divisors (159576057).

216875655 is a wasteful number, since it uses less digits than its factorization.

216875655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6855 (or 6852 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The square root of 216875655 is about 14726.6987135610. The cubic root of 216875655 is about 600.8096984891.

The spelling of 216875655 in words is "two hundred sixteen million, eight hundred seventy-five thousand, six hundred fifty-five".