18388686667 has 8 divisors (see below), whose sum is σ = 20968095456. Its totient is φ = 15975691392.

The previous prime is 18388686661. The next prime is 18388686683. The reversal of 18388686667 is 76668688381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18388686667 - 2¹¹ = 18388684619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18388686661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41603143 + ... + 41603584.

It is an arithmetic number, because the mean of its divisors is an integer number (2621011932).

Almost surely, 2^18388686667 is an apocalyptic number.

18388686667 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18388686667 is a deficient number, since it is larger than the sum of its proper divisors (2579408789).

18388686667 is a wasteful number, since it uses less digits than its factorization.

18388686667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83206757.

The product of its digits is 111476736, while the sum is 67.

The spelling of 18388686667 in words is "eighteen billion, three hundred eighty-eight million, six hundred eighty-six thousand, six hundred sixty-seven".