8656663668 has 12 divisors (see below), whose sum is σ = 20198881920. Its totient is φ = 2885554552.

The previous prime is 8656663661. The next prime is 8656663669. The reversal of 8656663668 is 8663666568.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8656663661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360694308 + ... + 360694331.

It is an arithmetic number, because the mean of its divisors is an integer number (1683240160).

Almost surely, 2^8656663668 is an apocalyptic number.

It is an amenable number.

8656663668 is an abundant number, since it is smaller than the sum of its proper divisors (11542218252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8656663668 is a wasteful number, since it uses less digits than its factorization.

8656663668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721388646 (or 721388644 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 60.

The square root of 8656663668 is about 93041.1933930342. The cubic root of 8656663668 is about 2053.2894773222.

The spelling of 8656663668 in words is "eight billion, six hundred fifty-six million, six hundred sixty-three thousand, six hundred sixty-eight".