20199860017 has 2 divisors, whose sum is σ = 20199860018. Its totient is φ = 20199860016.

The previous prime is 20199859993. The next prime is 20199860069. The reversal of 20199860017 is 71006899102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19853937216 + 345922801 = 140904^2 + 18599^2 .

It is a cyclic number.

It is not a de Polignac number, because 20199860017 - 2³¹ = 18052376369 is a prime.

It is not a weakly prime, because it can be changed into another prime (20199360017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099930008 + 10099930009.

It is an arithmetic number, because the mean of its divisors is an integer number (10099930009).

Almost surely, 2^20199860017 is an apocalyptic number.

It is an amenable number.

20199860017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20199860017 is an equidigital number, since it uses as much as digits as its factorization.

20199860017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 20199860017 in words is "twenty billion, one hundred ninety-nine million, eight hundred sixty thousand, seventeen".