216194236129 has 2 divisors, whose sum is σ = 216194236130. Its totient is φ = 216194236128.

The previous prime is 216194236121. The next prime is 216194236147. The reversal of 216194236129 is 921632491612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190555821729 + 25638414400 = 436527^2 + 160120^2 .

It is a cyclic number.

It is not a de Polignac number, because 216194236129 - 2³ = 216194236121 is a prime.

It is not a weakly prime, because it can be changed into another prime (216194236121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108097118064 + 108097118065.

It is an arithmetic number, because the mean of its divisors is an integer number (108097118065).

Almost surely, 2^216194236129 is an apocalyptic number.

It is an amenable number.

216194236129 is a deficient number, since it is larger than the sum of its proper divisors (1).

216194236129 is an equidigital number, since it uses as much as digits as its factorization.

216194236129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The spelling of 216194236129 in words is "two hundred sixteen billion, one hundred ninety-four million, two hundred thirty-six thousand, one hundred twenty-nine".