8423887020561 has 24 divisors (see below), whose sum is σ = 12183718627080. Its totient is φ = 5608596787200.

The previous prime is 8423887020559. The next prime is 8423887020607. The reversal of 8423887020561 is 1650207883248.

8423887020561 is a `hidden beast` number, since 8 + 4 + 2 + 3 + 8 + 8 + 70 + 2 + 0 + 561 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 425638161 + 8423461382400 = 20631^2 + 2902320^2 .

It is not a de Polignac number, because 8423887020561 - 2¹ = 8423887020559 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8423887020498 and 8423887020507.

It is not an unprimeable number, because it can be changed into a prime (8423887020551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48192441 + ... + 48366921.

It is an arithmetic number, because the mean of its divisors is an integer number (507654942795).

Almost surely, 2^{8423887020561} is an apocalyptic number.

It is an amenable number.

8423887020561 is a deficient number, since it is larger than the sum of its proper divisors (3759831606519).

8423887020561 is a wasteful number, since it uses less digits than its factorization.

8423887020561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181457 (or 181454 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 54.

The spelling of 8423887020561 in words is "eight trillion, four hundred twenty-three billion, eight hundred eighty-seven million, twenty thousand, five hundred sixty-one".