8500661 has 8 divisors (see below), whose sum is σ = 9310560. Its totient is φ = 7713072.

The previous prime is 8500643. The next prime is 8500673. The reversal of 8500661 is 1660058.

8500661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8500661 is a prime.

It is a super-2 number, since 2×8500661² = 144522474873842, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8500661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8500621) 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, 4775 + ... + 6308.

It is an arithmetic number, because the mean of its divisors is an integer number (1163820).

Almost surely, 2^8500661 is an apocalyptic number.

It is an amenable number.

8500661 is a deficient number, since it is larger than the sum of its proper divisors (809899).

8500661 is a wasteful number, since it uses less digits than its factorization.

8500661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11155.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 8500661 is about 2915.5893057837. The cubic root of 8500661 is about 204.0880451039.

The spelling of 8500661 in words is "eight million, five hundred thousand, six hundred sixty-one".