216774555 has 16 divisors (see below), whose sum is σ = 352719360. Its totient is φ = 113653088.

The previous prime is 216774539. The next prime is 216774589. The reversal of 216774555 is 555477612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 216774555 - 2⁴ = 216774539 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 121587 + ... + 123356.

It is an arithmetic number, because the mean of its divisors is an integer number (22044960).

Almost surely, 2^216774555 is an apocalyptic number.

216774555 is a deficient number, since it is larger than the sum of its proper divisors (135944805).

216774555 is a wasteful number, since it uses less digits than its factorization.

216774555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245010.

The product of its digits is 294000, while the sum is 42.

The square root of 216774555 is about 14723.2657722395. The cubic root of 216774555 is about 600.7163250127.

The spelling of 216774555 in words is "two hundred sixteen million, seven hundred seventy-four thousand, five hundred fifty-five".