636084650864 has 80 divisors (see below), whose sum is σ = 1350639407712. Its totient is φ = 288427474944.

The previous prime is 636084650827. The next prime is 636084650881. The reversal of 636084650864 is 468056480636.

It is a happy number.

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, 3820787 + ... + 3983789.

Almost surely, 2^636084650864 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 636084650864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (675319703856).

636084650864 is an abundant number, since it is smaller than the sum of its proper divisors (714554756848).

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

636084650864 is a wasteful number, since it uses less digits than its factorization.

636084650864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163354 (or 163348 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 56.

The spelling of 636084650864 in words is "six hundred thirty-six billion, eighty-four million, six hundred fifty thousand, eight hundred sixty-four".