20216768617 has 2 divisors, whose sum is σ = 20216768618. Its totient is φ = 20216768616.

The previous prime is 20216768609. The next prime is 20216768623. The reversal of 20216768617 is 71686761202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18576599616 + 1640169001 = 136296^2 + 40499^2 .

It is a cyclic number.

It is not a de Polignac number, because 20216768617 - 2³ = 20216768609 is a prime.

It is a super-3 number, since 3×20216768617³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20216768317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108384308 + 10108384309.

It is an arithmetic number, because the mean of its divisors is an integer number (10108384309).

Almost surely, 2^20216768617 is an apocalyptic number.

It is an amenable number.

20216768617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20216768617 is an equidigital number, since it uses as much as digits as its factorization.

20216768617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 20216768617 in words is "twenty billion, two hundred sixteen million, seven hundred sixty-eight thousand, six hundred seventeen".