636672529864 has 96 divisors (see below), whose sum is σ = 1472199356160. Its totient is φ = 256920854400.

The previous prime is 636672529853. The next prime is 636672529877. The reversal of 636672529864 is 468925276636.

It is a junction number, because it is equal to n+sod(n) for n = 636672529796 and 636672529805.

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 23 ways as a sum of consecutive naturals, for example, 258382 + ... + 1157629.

It is an arithmetic number, because the mean of its divisors is an integer number (15335409960).

Almost surely, 2^636672529864 is an apocalyptic number.

It is an amenable number.

636672529864 is an abundant number, since it is smaller than the sum of its proper divisors (835526826296).

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

636672529864 is a wasteful number, since it uses less digits than its factorization.

636672529864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416099 (or 1416088 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 64.

The spelling of 636672529864 in words is "six hundred thirty-six billion, six hundred seventy-two million, five hundred twenty-nine thousand, eight hundred sixty-four".