639930528693 has 6 divisors (see below), whose sum is σ = 924344097014. Its totient is φ = 426620352456.

The previous prime is 639930528683. The next prime is 639930528703. The reversal of 639930528693 is 396825039936.

639930528693 is a `hidden beast` number, since 6 + 399 + 30 + 52 + 86 + 93 = 666.

It is an interprime number because it is at equal distance from previous prime (639930528683) and next prime (639930528703).

It can be written as a sum of positive squares in only one way, i.e., 594390115089 + 45540413604 = 770967^2 + 213402^2 .

It is not a de Polignac number, because 639930528693 - 2¹⁰ = 639930527669 is a prime.

It is a super-2 number, since 2×639930528693² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 639930528693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639930528613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35551696030 + ... + 35551696047.

Almost surely, 2^639930528693 is an apocalyptic number.

It is an amenable number.

639930528693 is a deficient number, since it is larger than the sum of its proper divisors (284413568321).

639930528693 is a wasteful number, since it uses less digits than its factorization.

639930528693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71103392083 (or 71103392080 counting only the distinct ones).

The product of its (nonzero) digits is 56687040, while the sum is 63.

The spelling of 639930528693 in words is "six hundred thirty-nine billion, nine hundred thirty million, five hundred twenty-eight thousand, six hundred ninety-three".