18219667989 has 8 divisors (see below), whose sum is σ = 24625670272. Its totient is φ = 11980055520.

The previous prime is 18219667943. The next prime is 18219667993. The reversal of 18219667989 is 98976691281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18219667989 - 2⁸ = 18219667733 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 (18219667489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41597197 + ... + 41597634.

It is an arithmetic number, because the mean of its divisors is an integer number (3078208784).

Almost surely, 2^18219667989 is an apocalyptic number.

It is an amenable number.

18219667989 is a deficient number, since it is larger than the sum of its proper divisors (6406002283).

18219667989 is an equidigital number, since it uses as much as digits as its factorization.

18219667989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83194907.

The product of its digits is 23514624, while the sum is 66.

The spelling of 18219667989 in words is "eighteen billion, two hundred nineteen million, six hundred sixty-seven thousand, nine hundred eighty-nine".