639703637017 has 2 divisors, whose sum is σ = 639703637018. Its totient is φ = 639703637016.

The previous prime is 639703637011. The next prime is 639703637057. The reversal of 639703637017 is 710736307936.

639703637017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492938793216 + 146764843801 = 702096^2 + 383099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639703637017 is a prime.

It is not a weakly prime, because it can be changed into another prime (639703637011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319851818508 + 319851818509.

It is an arithmetic number, because the mean of its divisors is an integer number (319851818509).

Almost surely, 2^639703637017 is an apocalyptic number.

It is an amenable number.

639703637017 is a deficient number, since it is larger than the sum of its proper divisors (1).

639703637017 is an equidigital number, since it uses as much as digits as its factorization.

639703637017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000564, while the sum is 52.

The spelling of 639703637017 in words is "six hundred thirty-nine billion, seven hundred three million, six hundred thirty-seven thousand, seventeen".