636493639712 has 384 divisors, whose sum is σ = 1622008281600. Its totient is φ = 239324626944.

The previous prime is 636493639619. The next prime is 636493639759. The reversal of 636493639712 is 217936394636.

It is a happy number.

Its product of digits (26453952) is a multiple of the sum of its prime factors (756).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1556218964 + ... + 1556219372.

It is an arithmetic number, because the mean of its divisors is an integer number (4223979900).

Almost surely, 2^636493639712 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 636493639712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (811004140800).

636493639712 is an abundant number, since it is smaller than the sum of its proper divisors (985514641888).

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

636493639712 is a wasteful number, since it uses less digits than its factorization.

636493639712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 748 counting only the distinct ones).

The product of its digits is 26453952, while the sum is 59.

The spelling of 636493639712 in words is "six hundred thirty-six billion, four hundred ninety-three million, six hundred thirty-nine thousand, seven hundred twelve".