216515368439 has 2 divisors, whose sum is σ = 216515368440. Its totient is φ = 216515368438.

The previous prime is 216515368403. The next prime is 216515368453. The reversal of 216515368439 is 934863515612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216515368439 - 2⁸ = 216515368183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216515368739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108257684219 + 108257684220.

It is an arithmetic number, because the mean of its divisors is an integer number (108257684220).

Almost surely, 2^216515368439 is an apocalyptic number.

216515368439 is a deficient number, since it is larger than the sum of its proper divisors (1).

216515368439 is an equidigital number, since it uses as much as digits as its factorization.

216515368439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4665600, while the sum is 53.

The spelling of 216515368439 in words is "two hundred sixteen billion, five hundred fifteen million, three hundred sixty-eight thousand, four hundred thirty-nine".