18518351666851 has 8 divisors (see below), whose sum is σ = 19635286441680. Its totient is φ = 17415645360768.

The previous prime is 18518351666839. The next prime is 18518351666891. The reversal of 18518351666851 is 15866615381581.

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 18518351666851 - 2⁵ = 18518351666819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18518351666891) 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, 3557114506 + ... + 3557119711.

It is an arithmetic number, because the mean of its divisors is an integer number (2454410805210).

Almost surely, 2^{18518351666851} is an apocalyptic number.

18518351666851 is a deficient number, since it is larger than the sum of its proper divisors (1116934774829).

18518351666851 is a wasteful number, since it uses less digits than its factorization.

18518351666851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114234373.

The product of its digits is 41472000, while the sum is 64.

The spelling of 18518351666851 in words is "eighteen trillion, five hundred eighteen billion, three hundred fifty-one million, six hundred sixty-six thousand, eight hundred fifty-one".