8656663679 has 4 divisors (see below), whose sum is σ = 8693816976. Its totient is φ = 8619510384.

The previous prime is 8656663669. The next prime is 8656663703. The reversal of 8656663679 is 9763666568.

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 8656663679 - 2¹⁶ = 8656598143 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 (8656663669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18576299 + ... + 18576764.

It is an arithmetic number, because the mean of its divisors is an integer number (2173454244).

Almost surely, 2^8656663679 is an apocalyptic number.

8656663679 is a deficient number, since it is larger than the sum of its proper divisors (37153297).

8656663679 is a wasteful number, since it uses less digits than its factorization.

8656663679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37153296.

The product of its digits is 58786560, while the sum is 62.

The square root of 8656663679 is about 93041.1934521479. The cubic root of 8656663679 is about 2053.2894781919.

The spelling of 8656663679 in words is "eight billion, six hundred fifty-six million, six hundred sixty-three thousand, six hundred seventy-nine".