9657820121904 has 280 divisors, whose sum is σ = 28636352982000. Its totient is φ = 3152808562176.

The previous prime is 9657820121897. The next prime is 9657820121921. The reversal of 9657820121904 is 4091210287569.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 348028222 + ... + 348055970.

Almost surely, 2^{9657820121904} 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 9657820121904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14318176491000).

9657820121904 is an abundant number, since it is smaller than the sum of its proper divisors (18978532860096).

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

9657820121904 is a wasteful number, since it uses less digits than its factorization.

9657820121904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28391 (or 28370 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 9657820121904 in words is "nine trillion, six hundred fifty-seven billion, eight hundred twenty million, one hundred twenty-one thousand, nine hundred four".