8605616561 has 4 divisors (see below), whose sum is σ = 8686042992. Its totient is φ = 8525190132.

The previous prime is 8605616533. The next prime is 8605616573. The reversal of 8605616561 is 1656165068.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8605616561 - 2¹⁴ = 8605600177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8605615561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40213055 + ... + 40213268.

It is an arithmetic number, because the mean of its divisors is an integer number (2171510748).

Almost surely, 2^8605616561 is an apocalyptic number.

It is an amenable number.

8605616561 is a deficient number, since it is larger than the sum of its proper divisors (80426431).

8605616561 is a wasteful number, since it uses less digits than its factorization.

8605616561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80426430.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 8605616561 is about 92766.4624797130. The cubic root of 8605616561 is about 2049.2455332720.

The spelling of 8605616561 in words is "eight billion, six hundred five million, six hundred sixteen thousand, five hundred sixty-one".