216606353242 has 8 divisors (see below), whose sum is σ = 325681287732. Its totient is φ = 108045924000.

The previous prime is 216606353237. The next prime is 216606353291. The reversal of 216606353242 is 242353606612.

It can be written as a sum of positive squares in 2 ways, for example, as 182977762081 + 33628591161 = 427759^2 + 183381^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 216606353195 and 216606353204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128625259 + ... + 128626942.

Almost surely, 2^216606353242 is an apocalyptic number.

216606353242 is a deficient number, since it is larger than the sum of its proper divisors (109074934490).

216606353242 is a wasteful number, since it uses less digits than its factorization.

216606353242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257252624.

The product of its (nonzero) digits is 311040, while the sum is 40.

Adding to 216606353242 its reverse (242353606612), we get a palindrome (458959959854).

The spelling of 216606353242 in words is "two hundred sixteen billion, six hundred six million, three hundred fifty-three thousand, two hundred forty-two".