9538155680121 has 12 divisors (see below), whose sum is σ = 13778501632740. Its totient is φ = 6358232460960.

The previous prime is 9538155680117. The next prime is 9538155680161. The reversal of 9538155680121 is 1210865518359.

9538155680121 is a `hidden beast` number, since 9 + 5 + 3 + 8 + 1 + 556 + 80 + 1 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5294601000000 + 4243554680121 = 2301000^2 + 2059989^2 .

It is not a de Polignac number, because 9538155680121 - 2² = 9538155680117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9538155680161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44720406 + ... + 44933183.

It is an arithmetic number, because the mean of its divisors is an integer number (1148208469395).

Almost surely, 2^{9538155680121} is an apocalyptic number.

It is an amenable number.

9538155680121 is a deficient number, since it is larger than the sum of its proper divisors (4240345952619).

9538155680121 is a wasteful number, since it uses less digits than its factorization.

9538155680121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89665416 (or 89665413 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 54.

The spelling of 9538155680121 in words is "nine trillion, five hundred thirty-eight billion, one hundred fifty-five million, six hundred eighty thousand, one hundred twenty-one".