18164386240679 has 4 divisors (see below), whose sum is σ = 20759298560784. Its totient is φ = 15569473920576.

The previous prime is 18164386240673. The next prime is 18164386240681. The reversal of 18164386240679 is 97604268346181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18164386240679 is a prime.

It is a super-2 number, since 2×18164386240679² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18164386240673) 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 3 ways as a sum of consecutive naturals, for example, 1297456160042 + ... + 1297456160055.

It is an arithmetic number, because the mean of its divisors is an integer number (5189824640196).

Almost surely, 2^{18164386240679} is an apocalyptic number.

18164386240679 is a deficient number, since it is larger than the sum of its proper divisors (2594912320105).

18164386240679 is an equidigital number, since it uses as much as digits as its factorization.

18164386240679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2594912320104.

The product of its (nonzero) digits is 83607552, while the sum is 65.

The spelling of 18164386240679 in words is "eighteen trillion, one hundred sixty-four billion, three hundred eighty-six million, two hundred forty thousand, six hundred seventy-nine".