216720448455 has 96 divisors (see below), whose sum is σ = 407682823680. Its totient is φ = 98014613760.

The previous prime is 216720448433. The next prime is 216720448471. The reversal of 216720448455 is 554844027612.

It is not a de Polignac number, because 216720448455 - 2¹⁰ = 216720447431 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 66253470 + ... + 66256740.

It is an arithmetic number, because the mean of its divisors is an integer number (4246696080).

Almost surely, 2^216720448455 is an apocalyptic number.

216720448455 is a deficient number, since it is larger than the sum of its proper divisors (190962375225).

216720448455 is a wasteful number, since it uses less digits than its factorization.

216720448455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4229 (or 4222 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 48.

The spelling of 216720448455 in words is "two hundred sixteen billion, seven hundred twenty million, four hundred forty-eight thousand, four hundred fifty-five".