636236020642656 has 576 divisors, whose sum is σ = 2043789604577280. Its totient is φ = 172584183582720.

The previous prime is 636236020642627. The next prime is 636236020642679. The reversal of 636236020642656 is 656246020632636.

It is a junction number, because it is equal to n+sod(n) for n = 636236020642596 and 636236020642605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1808479186 + ... + 1808830958.

It is an arithmetic number, because the mean of its divisors is an integer number (3548245841280).

Almost surely, 2^{636236020642656} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636236020642656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021894802288640).

636236020642656 is an abundant number, since it is smaller than the sum of its proper divisors (1407553583934624).

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

636236020642656 is a wasteful number, since it uses less digits than its factorization.

636236020642656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352067 (or 352052 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 57.

The spelling of 636236020642656 in words is "six hundred thirty-six trillion, two hundred thirty-six billion, twenty million, six hundred forty-two thousand, six hundred fifty-six".