18445167899 has 4 divisors (see below), whose sum is σ = 18874125336. Its totient is φ = 18016210464.

The previous prime is 18445167889. The next prime is 18445167901. The reversal of 18445167899 is 99876154481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99876154481 = 43 ⋅2322701267.

It is a cyclic number.

It is not a de Polignac number, because 18445167899 - 2¹⁶ = 18445102363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18445167889) 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, 214478654 + ... + 214478739.

It is an arithmetic number, because the mean of its divisors is an integer number (4718531334).

Almost surely, 2^18445167899 is an apocalyptic number.

18445167899 is a deficient number, since it is larger than the sum of its proper divisors (428957437).

18445167899 is an equidigital number, since it uses as much as digits as its factorization.

18445167899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428957436.

The product of its digits is 17418240, while the sum is 62.

The spelling of 18445167899 in words is "eighteen billion, four hundred forty-five million, one hundred sixty-seven thousand, eight hundred ninety-nine".