216509192432856 has 24 divisors (see below), whose sum is σ = 586379062839180. Its totient is φ = 72169730810928.

The previous prime is 216509192432851. The next prime is 216509192432909. The reversal of 216509192432856 is 658234291905612.

216509192432856 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 0 + 9 + 192 + 432 + 8 + 5 + 6 = 666.

216509192432856 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 216509192432793 and 216509192432802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216509192432851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1503536058490 + ... + 1503536058633.

Almost surely, 2^{216509192432856} is an apocalyptic number.

It is an amenable number.

216509192432856 is an abundant number, since it is smaller than the sum of its proper divisors (369869870406324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216509192432856 is a wasteful number, since it uses less digits than its factorization.

216509192432856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007072117135 (or 3007072117128 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 63.

The spelling of 216509192432856 in words is "two hundred sixteen trillion, five hundred nine billion, one hundred ninety-two million, four hundred thirty-two thousand, eight hundred fifty-six".