18666346857 has 16 divisors (see below), whose sum is σ = 26442546240. Its totient is φ = 11690384832.

The previous prime is 18666346847. The next prime is 18666346879. The reversal of 18666346857 is 75864366681.

It is not a de Polignac number, because 18666346857 - 2⁷ = 18666346729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18666346857.

It is not an unprimeable number, because it can be changed into a prime (18666346837) 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 15 ways as a sum of consecutive naturals, for example, 2896183 + ... + 2902620.

It is an arithmetic number, because the mean of its divisors is an integer number (1652659140).

Almost surely, 2^18666346857 is an apocalyptic number.

It is an amenable number.

18666346857 is a deficient number, since it is larger than the sum of its proper divisors (7776199383).

18666346857 is a wasteful number, since it uses less digits than its factorization.

18666346857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5798872.

The product of its digits is 34836480, while the sum is 60.

The spelling of 18666346857 in words is "eighteen billion, six hundred sixty-six million, three hundred forty-six thousand, eight hundred fifty-seven".