216221808543465 has 64 divisors (see below), whose sum is σ = 347309418942720. Its totient is φ = 114867742187520.

The previous prime is 216221808543421. The next prime is 216221808543487. The reversal of 216221808543465 is 564345808122612.

It is not a de Polignac number, because 216221808543465 - 2⁶ = 216221808543401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17224705629 + ... + 17224718181.

It is an arithmetic number, because the mean of its divisors is an integer number (5426709670980).

Almost surely, 2^{216221808543465} is an apocalyptic number.

It is an amenable number.

216221808543465 is a deficient number, since it is larger than the sum of its proper divisors (131087610399255).

216221808543465 is a wasteful number, since it uses less digits than its factorization.

216221808543465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16954.

The product of its (nonzero) digits is 22118400, while the sum is 57.

The spelling of 216221808543465 in words is "two hundred sixteen trillion, two hundred twenty-one billion, eight hundred eight million, five hundred forty-three thousand, four hundred sixty-five".