9621171791880 has 256 divisors, whose sum is σ = 31860722995200. Its totient is φ = 2304906240000.

The previous prime is 9621171791867. The next prime is 9621171791969. The reversal of 9621171791880 is 881971711269.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 41211480 + ... + 41444280.

It is an arithmetic number, because the mean of its divisors is an integer number (124455949200).

Almost surely, 2^{9621171791880} 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 9621171791880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15930361497600).

9621171791880 is an abundant number, since it is smaller than the sum of its proper divisors (22239551203320).

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

9621171791880 is a wasteful number, since it uses less digits than its factorization.

9621171791880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233196 (or 233192 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 60.

The spelling of 9621171791880 in words is "nine trillion, six hundred twenty-one billion, one hundred seventy-one million, seven hundred ninety-one thousand, eight hundred eighty".