8561642722 has 4 divisors (see below), whose sum is σ = 12842464086. Its totient is φ = 4280821360.

The previous prime is 8561642701. The next prime is 8561642723. The reversal of 8561642722 is 2272461658.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 7740304441 + 821338281 = 87979^2 + 28659^2 .

It is not an unprimeable number, because it can be changed into a prime (8561642723) 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 as a sum of consecutive naturals, namely, 2140410679 + ... + 2140410682.

Almost surely, 2^8561642722 is an apocalyptic number.

8561642722 is a deficient number, since it is larger than the sum of its proper divisors (4280821364).

8561642722 is a wasteful number, since it uses less digits than its factorization.

8561642722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4280821363.

The product of its digits is 322560, while the sum is 43.

The square root of 8561642722 is about 92529.1452570486. The cubic root of 8561642722 is about 2045.7490911700.

The spelling of 8561642722 in words is "eight billion, five hundred sixty-one million, six hundred forty-two thousand, seven hundred twenty-two".