216365505 has 16 divisors (see below), whose sum is σ = 347639040. Its totient is φ = 114910208.

The previous prime is 216365459. The next prime is 216365537. The reversal of 216365505 is 505563612.

It is a cyclic number.

It is not a de Polignac number, because 216365505 - 2⁶ = 216365441 is a prime.

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, 26592 + ... + 33761.

It is an arithmetic number, because the mean of its divisors is an integer number (21727440).

Almost surely, 2^216365505 is an apocalyptic number.

It is an amenable number.

216365505 is a deficient number, since it is larger than the sum of its proper divisors (131273535).

216365505 is a wasteful number, since it uses less digits than its factorization.

216365505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60600.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 216365505 is about 14709.3679333954. The cubic root of 216365505 is about 600.3382398427.

The spelling of 216365505 in words is "two hundred sixteen million, three hundred sixty-five thousand, five hundred five".