636660984960 has 1280 divisors, whose sum is σ = 3052956614400. Its totient is φ = 122106839040.

The previous prime is 636660984893. The next prime is 636660984983. The reversal of 636660984960 is 69489066636.

It is a Harshad number since it is a multiple of its sum of digits (63).

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 159 ways as a sum of consecutive naturals, for example, 51885706 + ... + 51897974.

It is an arithmetic number, because the mean of its divisors is an integer number (2385122355).

Almost surely, 2^636660984960 is an apocalyptic number.

636660984960 is a gapful number since it is divisible by the number (60) 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 636660984960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1526478307200).

636660984960 is an abundant number, since it is smaller than the sum of its proper divisors (2416295629440).

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

636660984960 is a wasteful number, since it uses less digits than its factorization.

636660984960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12331 (or 12310 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 63.

The spelling of 636660984960 in words is "six hundred thirty-six billion, six hundred sixty million, nine hundred eighty-four thousand, nine hundred sixty".