636063817040 has 20 divisors (see below), whose sum is σ = 1478848374804. Its totient is φ = 254425526784.

The previous prime is 636063817031. The next prime is 636063817073. The reversal of 636063817040 is 40718360636.

It can be written as a sum of positive squares in 2 ways, for example, as 64715289664 + 571348527376 = 254392^2 + 755876^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 636063816982 and 636063817000.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3975398777 + ... + 3975398936.

Almost surely, 2^636063817040 is an apocalyptic number.

It is an amenable number.

636063817040 is an abundant number, since it is smaller than the sum of its proper divisors (842784557764).

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

636063817040 is a wasteful number, since it uses less digits than its factorization.

636063817040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7950797726 (or 7950797720 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 636063817040 in words is "six hundred thirty-six billion, sixty-three million, eight hundred seventeen thousand, forty".