8888861561 has 16 divisors (see below), whose sum is σ = 9525600000. Its totient is φ = 8270292096.

The previous prime is 8888861549. The next prime is 8888861567. The reversal of 8888861561 is 1651688888.

It is a cyclic number.

It is not a de Polignac number, because 8888861561 - 2²⁶ = 8821752697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8888861561.

It is not an unprimeable number, because it can be changed into a prime (8888861567) 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, 234320 + ... + 269598.

It is an arithmetic number, because the mean of its divisors is an integer number (595350000).

Almost surely, 2^8888861561 is an apocalyptic number.

It is an amenable number.

8888861561 is a deficient number, since it is larger than the sum of its proper divisors (636738439).

8888861561 is a wasteful number, since it uses less digits than its factorization.

8888861561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35536.

The product of its digits is 5898240, while the sum is 59.

The square root of 8888861561 is about 94280.7592300783. The cubic root of 8888861561 is about 2071.4862144478.

The spelling of 8888861561 in words is "eight billion, eight hundred eighty-eight million, eight hundred sixty-one thousand, five hundred sixty-one".