8000661 has 4 divisors (see below), whose sum is σ = 10667552. Its totient is φ = 5333772.

The previous prime is 8000651. The next prime is 8000677. The reversal of 8000661 is 1660008.

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 not a de Polignac number, because 8000661 - 2⁷ = 8000533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8000611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1333441 + ... + 1333446.

It is an arithmetic number, because the mean of its divisors is an integer number (2666888).

Almost surely, 2^8000661 is an apocalyptic number.

It is an amenable number.

8000661 is a deficient number, since it is larger than the sum of its proper divisors (2666891).

8000661 is a wasteful number, since it uses less digits than its factorization.

8000661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666890.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 8000661 is about 2828.5439717282. The cubic root of 8000661 is about 200.0055081816.

Adding to 8000661 its reverse (1660008), we get a palindrome (9660669).

The spelling of 8000661 in words is "eight million, six hundred sixty-one", and thus it is an aban number.