8566872661 has 4 divisors (see below), whose sum is σ = 8843223424. Its totient is φ = 8290521900.

The previous prime is 8566872649. The next prime is 8566872667. The reversal of 8566872661 is 1662786658.

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 8566872661 - 2⁷ = 8566872533 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 (8566872667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138175335 + ... + 138175396.

It is an arithmetic number, because the mean of its divisors is an integer number (2210805856).

Almost surely, 2^8566872661 is an apocalyptic number.

It is an amenable number.

8566872661 is a deficient number, since it is larger than the sum of its proper divisors (276350763).

8566872661 is a wasteful number, since it uses less digits than its factorization.

8566872661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276350762.

The product of its digits is 5806080, while the sum is 55.

The square root of 8566872661 is about 92557.4019784479. The cubic root of 8566872661 is about 2046.1655597339.

The spelling of 8566872661 in words is "eight billion, five hundred sixty-six million, eight hundred seventy-two thousand, six hundred sixty-one".