8668618509 has 4 divisors (see below), whose sum is σ = 11558158016. Its totient is φ = 5779079004.

The previous prime is 8668618499. The next prime is 8668618523. The reversal of 8668618509 is 9058168668.

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 8668618509 - 2⁴ = 8668618493 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 (8668618559) 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, 1444769749 + ... + 1444769754.

It is an arithmetic number, because the mean of its divisors is an integer number (2889539504).

Almost surely, 2^8668618509 is an apocalyptic number.

It is an amenable number.

8668618509 is a deficient number, since it is larger than the sum of its proper divisors (2889539507).

8668618509 is a wasteful number, since it uses less digits than its factorization.

8668618509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889539506.

The product of its (nonzero) digits is 4976640, while the sum is 57.

The square root of 8668618509 is about 93105.4161099127. The cubic root of 8668618509 is about 2054.2342392288.

The spelling of 8668618509 in words is "eight billion, six hundred sixty-eight million, six hundred eighteen thousand, five hundred nine".