639993600017 has 2 divisors, whose sum is σ = 639993600018. Its totient is φ = 639993600016.

The previous prime is 639993599989. The next prime is 639993600019. The reversal of 639993600017 is 710006399936.

It is a happy number.

It is a Cunningham number, because it is equal to 799996²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639993600016 + 1 = 799996^2 + 1^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639993600017 is a prime.

Together with 639993600019, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (639993600019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319996800008 + 319996800009.

It is an arithmetic number, because the mean of its divisors is an integer number (319996800009).

Almost surely, 2^639993600017 is an apocalyptic number.

It is an amenable number.

639993600017 is a deficient number, since it is larger than the sum of its proper divisors (1).

639993600017 is an equidigital number, since it uses as much as digits as its factorization.

639993600017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1653372, while the sum is 53.

The spelling of 639993600017 in words is "six hundred thirty-nine billion, nine hundred ninety-three million, six hundred thousand, seventeen".