639166703092 has 6 divisors (see below), whose sum is σ = 1118541730418. Its totient is φ = 319583351544.

The previous prime is 639166703057. The next prime is 639166703093. The reversal of 639166703092 is 290307661936.

It can be written as a sum of positive squares in only one way, i.e., 508488791056 + 130677912036 = 713084^2 + 361494^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639166703093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79895837883 + ... + 79895837890.

Almost surely, 2^639166703092 is an apocalyptic number.

It is an amenable number.

639166703092 is a deficient number, since it is larger than the sum of its proper divisors (479375027326).

639166703092 is a wasteful number, since it uses less digits than its factorization.

639166703092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159791675777 (or 159791675775 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 52.

The spelling of 639166703092 in words is "six hundred thirty-nine billion, one hundred sixty-six million, seven hundred three thousand, ninety-two".