8427944972161 has 16 divisors (see below), whose sum is σ = 9901463539968. Its totient is φ = 7072328793600.

The previous prime is 8427944972129. The next prime is 8427944972221. The reversal of 8427944972161 is 1612794497248.

It is a cyclic number.

It is not a de Polignac number, because 8427944972161 - 2⁵ = 8427944972129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8427944972093 and 8427944972102.

It is not an unprimeable number, because it can be changed into a prime (8427944972261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17216200 + ... + 17698966.

It is an arithmetic number, because the mean of its divisors is an integer number (618841471248).

Almost surely, 2^{8427944972161} is an apocalyptic number.

It is an amenable number.

8427944972161 is a deficient number, since it is larger than the sum of its proper divisors (1473518567807).

8427944972161 is a wasteful number, since it uses less digits than its factorization.

8427944972161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604872.

The product of its digits is 48771072, while the sum is 64.

The spelling of 8427944972161 in words is "eight trillion, four hundred twenty-seven billion, nine hundred forty-four million, nine hundred seventy-two thousand, one hundred sixty-one".