18218365640409 has 8 divisors (see below), whose sum is σ = 26499440931552. Its totient is φ = 11041433721440.

The previous prime is 18218365640399. The next prime is 18218365640429. The reversal of 18218365640409 is 90404656381281.

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 18218365640409 - 2¹⁶ = 18218365574873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18218365640429) 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 7 ways as a sum of consecutive naturals, for example, 276035843004 + ... + 276035843069.

It is an arithmetic number, because the mean of its divisors is an integer number (3312430116444).

Almost surely, 2^{18218365640409} is an apocalyptic number.

It is an amenable number.

18218365640409 is a deficient number, since it is larger than the sum of its proper divisors (8281075291143).

18218365640409 is a wasteful number, since it uses less digits than its factorization.

18218365640409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552071686087.

The product of its (nonzero) digits is 9953280, while the sum is 57.

The spelling of 18218365640409 in words is "eighteen trillion, two hundred eighteen billion, three hundred sixty-five million, six hundred forty thousand, four hundred nine".