9557961673920 has 1344 divisors, whose sum is σ = 36155323330560. Its totient is φ = 2119001702400.

The previous prime is 9557961673891. The next prime is 9557961673927. The reversal of 9557961673920 is 293761697559.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is not an unprimeable number, because it can be changed into a prime (9557961673927) by changing a digit.

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 191 ways as a sum of consecutive naturals, for example, 16797823396 + ... + 16797823964.

It is an arithmetic number, because the mean of its divisors is an integer number (26901282240).

Almost surely, 2^{9557961673920} 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 9557961673920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18077661665280).

9557961673920 is an abundant number, since it is smaller than the sum of its proper divisors (26597361656640).

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

9557961673920 is a wasteful number, since it uses less digits than its factorization.

9557961673920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 192893400, while the sum is 69.

The spelling of 9557961673920 in words is "nine trillion, five hundred fifty-seven billion, nine hundred sixty-one million, six hundred seventy-three thousand, nine hundred twenty".