8656561387 has 4 divisors (see below), whose sum is σ = 8663125680. Its totient is φ = 8649997096.

The previous prime is 8656561357. The next prime is 8656561411. The reversal of 8656561387 is 7831656568.

8656561387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8656561387 - 2⁷ = 8656561259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8656561357) 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, 3280168 + ... + 3282805.

It is an arithmetic number, because the mean of its divisors is an integer number (2165781420).

Almost surely, 2^8656561387 is an apocalyptic number.

8656561387 is a deficient number, since it is larger than the sum of its proper divisors (6564293).

8656561387 is a wasteful number, since it uses less digits than its factorization.

8656561387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6564292.

The product of its digits is 7257600, while the sum is 55.

The square root of 8656561387 is about 93040.6437370249. The cubic root of 8656561387 is about 2053.2813905529.

The spelling of 8656561387 in words is "eight billion, six hundred fifty-six million, five hundred sixty-one thousand, three hundred eighty-seven".