18556763198399 has 8 divisors (see below), whose sum is σ = 18567004615008. Its totient is φ = 18546523763040.

The previous prime is 18556763198387. The next prime is 18556763198443. The reversal of 18556763198399 is 99389136765581.

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 18556763198399 - 2¹² = 18556763194303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18556763158399) 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, 18441569 + ... + 19421765.

It is an arithmetic number, because the mean of its divisors is an integer number (2320875576876).

Almost surely, 2^{18556763198399} is an apocalyptic number.

18556763198399 is a deficient number, since it is larger than the sum of its proper divisors (10241416609).

18556763198399 is an equidigital number, since it uses as much as digits as its factorization.

18556763198399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990625.

The product of its digits is 2645395200, while the sum is 80.

The spelling of 18556763198399 in words is "eighteen trillion, five hundred fifty-six billion, seven hundred sixty-three million, one hundred ninety-eight thousand, three hundred ninety-nine".