8128855344961 has 6 divisors (see below), whose sum is σ = 8802251645910. Its totient is φ = 7503558779808.

The previous prime is 8128855344949. The next prime is 8128855344971. The reversal of 8128855344961 is 1694435588218.

It can be written as a sum of positive squares in 3 ways, for example, as 778417998400 + 7350437346561 = 882280^2 + 2711169^2 .

It is not a de Polignac number, because 8128855344961 - 2²⁹ = 8128318474049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8128855344893 and 8128855344902.

It is not an unprimeable number, because it can be changed into a prime (8128855344971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24049867716 + ... + 24049868053.

It is an arithmetic number, because the mean of its divisors is an integer number (1467041940985).

Almost surely, 2^{8128855344961} is an apocalyptic number.

It is an amenable number.

8128855344961 is a deficient number, since it is larger than the sum of its proper divisors (673396300949).

8128855344961 is a wasteful number, since it uses less digits than its factorization.

8128855344961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48099735795 (or 48099735782 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 64.

The spelling of 8128855344961 in words is "eight trillion, one hundred twenty-eight billion, eight hundred fifty-five million, three hundred forty-four thousand, nine hundred sixty-one".