636624330816 has 448 divisors, whose sum is σ = 1891043573760. Its totient is φ = 188080619520.

The previous prime is 636624330787. The next prime is 636624330817. The reversal of 636624330816 is 618033426636.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (636624330817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1250735170 + ... + 1250735678.

Almost surely, 2^636624330816 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 636624330816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945521786880).

636624330816 is an abundant number, since it is smaller than the sum of its proper divisors (1254419242944).

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

636624330816 is a wasteful number, since it uses less digits than its factorization.

636624330816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882 (or 872 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 48.

The spelling of 636624330816 in words is "six hundred thirty-six billion, six hundred twenty-four million, three hundred thirty thousand, eight hundred sixteen".