18658686673821 has 8 divisors (see below), whose sum is σ = 24883316803360. Its totient is φ = 12436590496752.

The previous prime is 18658686673747. The next prime is 18658686673849. The reversal of 18658686673821 is 12837668685681.

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

It is not a de Polignac number, because 18658686673821 - 2¹³ = 18658686665629 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 (18658686673871) 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 7 ways as a sum of consecutive naturals, for example, 633470935 + ... + 633500388.

It is an arithmetic number, because the mean of its divisors is an integer number (3110414600420).

Almost surely, 2^{18658686673821} is an apocalyptic number.

It is an amenable number.

18658686673821 is a deficient number, since it is larger than the sum of its proper divisors (6224630129539).

18658686673821 is a wasteful number, since it uses less digits than its factorization.

18658686673821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266976235.

The product of its digits is 1114767360, while the sum is 75.

The spelling of 18658686673821 in words is "eighteen trillion, six hundred fifty-eight billion, six hundred eighty-six million, six hundred seventy-three thousand, eight hundred twenty-one".