18659456372109 has 64 divisors (see below), whose sum is σ = 29417358823424. Its totient is φ = 10299360024576.

The previous prime is 18659456372101. The next prime is 18659456372111. The reversal of 18659456372109 is 90127365495681.

It is not a de Polignac number, because 18659456372109 - 2³ = 18659456372101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18659456372109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18659456372101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68038749 + ... + 68312445.

It is an arithmetic number, because the mean of its divisors is an integer number (459646231616).

It is a 1-persistent number, because it is pandigital, but 2⋅18659456372109 = 37318912744218 is not.

Almost surely, 2^{18659456372109} is an apocalyptic number.

It is an amenable number.

18659456372109 is a deficient number, since it is larger than the sum of its proper divisors (10757902451315).

18659456372109 is a wasteful number, since it uses less digits than its factorization.

18659456372109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274586.

The product of its (nonzero) digits is 97977600, while the sum is 66.

The spelling of 18659456372109 in words is "eighteen trillion, six hundred fifty-nine billion, four hundred fifty-six million, three hundred seventy-two thousand, one hundred nine".