216091430377 has 2 divisors, whose sum is σ = 216091430378. Its totient is φ = 216091430376.

The previous prime is 216091430351. The next prime is 216091430389. The reversal of 216091430377 is 773034190612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193621120576 + 22470309801 = 440024^2 + 149901^2 .

It is a cyclic number.

It is not a de Polignac number, because 216091430377 - 2¹⁹ = 216090906089 is a prime.

It is not a weakly prime, because it can be changed into another prime (216091430327) 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, 108045715188 + 108045715189.

It is an arithmetic number, because the mean of its divisors is an integer number (108045715189).

Almost surely, 2^216091430377 is an apocalyptic number.

It is an amenable number.

216091430377 is a deficient number, since it is larger than the sum of its proper divisors (1).

216091430377 is an equidigital number, since it uses as much as digits as its factorization.

216091430377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 216091430377 in words is "two hundred sixteen billion, ninety-one million, four hundred thirty thousand, three hundred seventy-seven".