18918468685 has 8 divisors (see below), whose sum is σ = 22730160096. Its totient is φ = 15116109840.

The previous prime is 18918468677. The next prime is 18918468689. The reversal of 18918468685 is 58686481981.

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

It is not a de Polignac number, because 18918468685 - 2³ = 18918468677 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 (18918468689) 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 7 ways as a sum of consecutive naturals, for example, 2328679 + ... + 2336788.

It is an arithmetic number, because the mean of its divisors is an integer number (2841270012).

Almost surely, 2^18918468685 is an apocalyptic number.

It is an amenable number.

18918468685 is a deficient number, since it is larger than the sum of its proper divisors (3811691411).

18918468685 is an equidigital number, since it uses as much as digits as its factorization.

18918468685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666283.

The product of its digits is 26542080, while the sum is 64.

The spelling of 18918468685 in words is "eighteen billion, nine hundred eighteen million, four hundred sixty-eight thousand, six hundred eighty-five".