18668371851 has 12 divisors (see below), whose sum is σ = 27064932960. Its totient is φ = 12399654960.

The previous prime is 18668371837. The next prime is 18668371859. The reversal of 18668371851 is 15817386681.

It is not a de Polignac number, because 18668371851 - 2⁵ = 18668371819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18668371859) 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 11 ways as a sum of consecutive naturals, for example, 3824616 + ... + 3829493.

It is an arithmetic number, because the mean of its divisors is an integer number (2255411080).

Almost surely, 2^18668371851 is an apocalyptic number.

18668371851 is a deficient number, since it is larger than the sum of its proper divisors (8396561109).

18668371851 is a wasteful number, since it uses less digits than its factorization.

18668371851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7654386 (or 7654383 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 18668371851 in words is "eighteen billion, six hundred sixty-eight million, three hundred seventy-one thousand, eight hundred fifty-one".