216611242187 has 2 divisors, whose sum is σ = 216611242188. Its totient is φ = 216611242186.

The previous prime is 216611242123. The next prime is 216611242219. The reversal of 216611242187 is 781242116612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216611242187 - 2⁶ = 216611242123 is a prime.

It is not a weakly prime, because it can be changed into another prime (216611242117) 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 as a sum of consecutive naturals, namely, 108305621093 + 108305621094.

It is an arithmetic number, because the mean of its divisors is an integer number (108305621094).

Almost surely, 2^216611242187 is an apocalyptic number.

216611242187 is a deficient number, since it is larger than the sum of its proper divisors (1).

216611242187 is an equidigital number, since it uses as much as digits as its factorization.

216611242187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

Adding to 216611242187 its reverse (781242116612), we get a palindrome (997853358799).

The spelling of 216611242187 in words is "two hundred sixteen billion, six hundred eleven million, two hundred forty-two thousand, one hundred eighty-seven".