8645661 has 12 divisors (see below), whose sum is σ = 12579840. Its totient is φ = 5721480.

The previous prime is 8645657. The next prime is 8645669. The reversal of 8645661 is 1665468.

8645661 is a `hidden beast` number, since 8 + 645 + 6 + 6 + 1 = 666.

8645661 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8645661 - 2² = 8645657 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8645669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2205 + ... + 4706.

It is an arithmetic number, because the mean of its divisors is an integer number (1048320).

Almost surely, 2^8645661 is an apocalyptic number.

It is an amenable number.

8645661 is a deficient number, since it is larger than the sum of its proper divisors (3934179).

8645661 is a wasteful number, since it uses less digits than its factorization.

8645661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7056 (or 7053 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 8645661 is about 2940.3504893125. The cubic root of 8645661 is about 205.2419194365.

The spelling of 8645661 in words is "eight million, six hundred forty-five thousand, six hundred sixty-one".