636341285856 has 96 divisors (see below), whose sum is σ = 1758723321600. Its totient is φ = 200902809600.

The previous prime is 636341285849. The next prime is 636341285863. The reversal of 636341285856 is 658582143636.

It is an interprime number because it is at equal distance from previous prime (636341285849) and next prime (636341285863).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 636341285796 and 636341285805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8204056 + ... + 8281256.

It is an arithmetic number, because the mean of its divisors is an integer number (18320034600).

Almost surely, 2^636341285856 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 636341285856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (879361660800).

636341285856 is an abundant number, since it is smaller than the sum of its proper divisors (1122382035744).

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

636341285856 is a wasteful number, since it uses less digits than its factorization.

636341285856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81752 (or 81744 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 57.

The spelling of 636341285856 in words is "six hundred thirty-six billion, three hundred forty-one million, two hundred eighty-five thousand, eight hundred fifty-six".