639166703393 has 2 divisors, whose sum is σ = 639166703394. Its totient is φ = 639166703392.

The previous prime is 639166703389. The next prime is 639166703411. The reversal of 639166703393 is 393307661936.

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., 631861240609 + 7305462784 = 794897^2 + 85472^2 .

It is a cyclic number.

It is not a de Polignac number, because 639166703393 - 2² = 639166703389 is a prime.

It is not a weakly prime, because it can be changed into another prime (639166703093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319583351696 + 319583351697.

It is an arithmetic number, because the mean of its divisors is an integer number (319583351697).

Almost surely, 2^639166703393 is an apocalyptic number.

It is an amenable number.

639166703393 is a deficient number, since it is larger than the sum of its proper divisors (1).

639166703393 is an equidigital number, since it uses as much as digits as its factorization.

639166703393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9920232, while the sum is 56.

The spelling of 639166703393 in words is "six hundred thirty-nine billion, one hundred sixty-six million, seven hundred three thousand, three hundred ninety-three".