9643881428550 has 72 divisors (see below), whose sum is σ = 26869520537496. Its totient is φ = 2571701711040.

The previous prime is 9643881428453. The next prime is 9643881428561. The reversal of 9643881428550 is 558241883469.

9643881428550 is a `hidden beast` number, since 9 + 6 + 4 + 38 + 8 + 1 + 42 + 8 + 550 = 666.

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 35 ways as a sum of consecutive naturals, for example, 396855399 + ... + 396879698.

It is an arithmetic number, because the mean of its divisors is an integer number (373187785243).

Almost surely, 2^{9643881428550} is an apocalyptic number.

9643881428550 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

9643881428550 is an abundant number, since it is smaller than the sum of its proper divisors (17225639108946).

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

9643881428550 is a wasteful number, since it uses less digits than its factorization.

9643881428550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793735124 (or 793735107 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 63.

The spelling of 9643881428550 in words is "nine trillion, six hundred forty-three billion, eight hundred eighty-one million, four hundred twenty-eight thousand, five hundred fifty".