216256561242 has 8 divisors (see below), whose sum is σ = 432513122496. Its totient is φ = 72085520412.

The previous prime is 216256561219. The next prime is 216256561243. The reversal of 216256561242 is 242165652612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

216256561242 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 216256561194 and 216256561203.

It is not an unprimeable number, because it can be changed into a prime (216256561243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18021380098 + ... + 18021380109.

It is an arithmetic number, because the mean of its divisors is an integer number (54064140312).

Almost surely, 2^216256561242 is an apocalyptic number.

216256561242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216256561242 is a wasteful number, since it uses less digits than its factorization.

216256561242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36042760212.

The product of its digits is 345600, while the sum is 42.

The spelling of 216256561242 in words is "two hundred sixteen billion, two hundred fifty-six million, five hundred sixty-one thousand, two hundred forty-two".