636424424636 has 144 divisors (see below), whose sum is σ = 1550800067040. Its totient is φ = 224564820480.

The previous prime is 636424424617. The next prime is 636424424641.

636424424636 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1271270 + ... + 1699698.

It is an arithmetic number, because the mean of its divisors is an integer number (10769444910).

Almost surely, 2^636424424636 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 636424424636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (775400033520).

636424424636 is an abundant number, since it is smaller than the sum of its proper divisors (914375642404).

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

636424424636 is a wasteful number, since it uses less digits than its factorization.

636424424636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428524 (or 428515 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 50.

The spelling of 636424424636 in words is "six hundred thirty-six billion, four hundred twenty-four million, four hundred twenty-four thousand, six hundred thirty-six".