63639400668 has 48 divisors (see below), whose sum is σ = 153846000000. Its totient is φ = 20450492608.

The previous prime is 63639400633. The next prime is 63639400723. The reversal of 63639400668 is 86600493636.

It is a self number, because there is not a number n which added to its sum of digits gives 63639400668.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90583 + ... + 368081.

It is an arithmetic number, because the mean of its divisors is an integer number (3205125000).

Almost surely, 2^63639400668 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 63639400668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76923000000).

63639400668 is an abundant number, since it is smaller than the sum of its proper divisors (90206599332).

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

63639400668 is a wasteful number, since it uses less digits than its factorization.

63639400668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278194 (or 278192 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 51.

The spelling of 63639400668 in words is "sixty-three billion, six hundred thirty-nine million, four hundred thousand, six hundred sixty-eight".