639166703093 has 2 divisors, whose sum is σ = 639166703094. Its totient is φ = 639166703092.

The previous prime is 639166703057. The next prime is 639166703117. The reversal of 639166703093 is 390307661936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565055896804 + 74110806289 = 751702^2 + 272233^2 .

It is a cyclic number.

It is not a de Polignac number, because 639166703093 - 2³⁶ = 570447226357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639166703393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319583351546 + 319583351547.

It is an arithmetic number, because the mean of its divisors is an integer number (319583351547).

Almost surely, 2^639166703093 is an apocalyptic number.

It is an amenable number.

639166703093 is a deficient number, since it is larger than the sum of its proper divisors (1).

639166703093 is an equidigital number, since it uses as much as digits as its factorization.

639166703093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 53.

The spelling of 639166703093 in words is "six hundred thirty-nine billion, one hundred sixty-six million, seven hundred three thousand, ninety-three".