636664963264 has 224 divisors, whose sum is σ = 1483113494016. Its totient is φ = 267955322880.

The previous prime is 636664963237. The next prime is 636664963271. The reversal of 636664963264 is 462369466636.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 261248254 + ... + 261250690.

It is an arithmetic number, because the mean of its divisors is an integer number (6621042384).

Almost surely, 2^636664963264 is an apocalyptic number.

636664963264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636664963264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741556747008).

636664963264 is an abundant number, since it is smaller than the sum of its proper divisors (846448530752).

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

636664963264 is a wasteful number, since it uses less digits than its factorization.

636664963264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823 (or 2813 counting only the distinct ones).

The product of its digits is 120932352, while the sum is 61.

The spelling of 636664963264 in words is "six hundred thirty-six billion, six hundred sixty-four million, nine hundred sixty-three thousand, two hundred sixty-four".