8645989561 has 8 divisors (see below), whose sum is σ = 9529226784. Its totient is φ = 7778958720.

The previous prime is 8645989553. The next prime is 8645989613. The reversal of 8645989561 is 1659895468.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8645989561 - 2³ = 8645989553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8645989561.

It is not an unprimeable number, because it can be changed into a prime (8645989511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4050475 + ... + 4052608.

It is an arithmetic number, because the mean of its divisors is an integer number (1191153348).

Almost surely, 2^8645989561 is an apocalyptic number.

It is an amenable number.

8645989561 is a deficient number, since it is larger than the sum of its proper divisors (883237223).

8645989561 is a wasteful number, since it uses less digits than its factorization.

8645989561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8103191.

The product of its digits is 18662400, while the sum is 61.

The square root of 8645989561 is about 92983.8134354577. The cubic root of 8645989561 is about 2052.4451933936.

The spelling of 8645989561 in words is "eight billion, six hundred forty-five million, nine hundred eighty-nine thousand, five hundred sixty-one".