20216655317 has 2 divisors, whose sum is σ = 20216655318. Its totient is φ = 20216655316.

The previous prime is 20216655307. The next prime is 20216655343. The reversal of 20216655317 is 71355661202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14946040516 + 5270614801 = 122254^2 + 72599^2 .

It is a cyclic number.

It is not a de Polignac number, because 20216655317 - 2⁸ = 20216655061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20216655307) 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, 10108327658 + 10108327659.

It is an arithmetic number, because the mean of its divisors is an integer number (10108327659).

Almost surely, 2^20216655317 is an apocalyptic number.

It is an amenable number.

20216655317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20216655317 is an equidigital number, since it uses as much as digits as its factorization.

20216655317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 20216655317 in words is "twenty billion, two hundred sixteen million, six hundred fifty-five thousand, three hundred seventeen".