8957721069161 has 4 divisors (see below), whose sum is σ = 8957779911300. Its totient is φ = 8957662227024.

The previous prime is 8957721069139. The next prime is 8957721069163. The reversal of 8957721069161 is 1619601277598.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7312481305600 + 1645239763561 = 2704160^2 + 1282669^2 .

It is a cyclic number.

It is not a de Polignac number, because 8957721069161 - 2²² = 8957716874857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8957721069094 and 8957721069103.

It is not an unprimeable number, because it can be changed into a prime (8957721069163) 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 3 ways as a sum of consecutive naturals, for example, 29192126 + ... + 29497383.

It is an arithmetic number, because the mean of its divisors is an integer number (2239444977825).

Almost surely, 2^{8957721069161} is an apocalyptic number.

It is an amenable number.

8957721069161 is a deficient number, since it is larger than the sum of its proper divisors (58842139).

8957721069161 is a wasteful number, since it uses less digits than its factorization.

8957721069161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58842138.

The product of its (nonzero) digits is 11430720, while the sum is 62.

The spelling of 8957721069161 in words is "eight trillion, nine hundred fifty-seven billion, seven hundred twenty-one million, sixty-nine thousand, one hundred sixty-one".