639063694660 has 24 divisors (see below), whose sum is σ = 1342066133016. Its totient is φ = 255619311360.

The previous prime is 639063694609. The next prime is 639063694669. The reversal of 639063694660 is 66496360936.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13221320256 + 625842374404 = 114984^2 + 791102^2 .

It is a junction number, because it is equal to n+sod(n) for n = 639063694595 and 639063694604.

It is not an unprimeable number, because it can be changed into a prime (639063694669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515794 + ... + 1242646.

It is an arithmetic number, because the mean of its divisors is an integer number (55919422209).

Almost surely, 2^639063694660 is an apocalyptic number.

It is an amenable number.

639063694660 is an abundant number, since it is smaller than the sum of its proper divisors (703002438356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639063694660 is a wasteful number, since it uses less digits than its factorization.

639063694660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770823 (or 770821 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 58.

The spelling of 639063694660 in words is "six hundred thirty-nine billion, sixty-three million, six hundred ninety-four thousand, six hundred sixty".