216611242172 has 24 divisors (see below), whose sum is σ = 408256603776. Its totient is φ = 99967629888.

The previous prime is 216611242123. The next prime is 216611242187. The reversal of 216611242172 is 271242116612.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 676658 + ... + 943974.

It is an arithmetic number, because the mean of its divisors is an integer number (17010691824).

Almost surely, 2^216611242172 is an apocalyptic number.

It is an amenable number.

216611242172 is a deficient number, since it is larger than the sum of its proper divisors (191645361604).

216611242172 is a wasteful number, since it uses less digits than its factorization.

216611242172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282917 (or 282915 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

Adding to 216611242172 its reverse (271242116612), we get a palindrome (487853358784).

The spelling of 216611242172 in words is "two hundred sixteen billion, six hundred eleven million, two hundred forty-two thousand, one hundred seventy-two".