18991441223 has 8 divisors (see below), whose sum is σ = 19121644080. Its totient is φ = 18861506560.

The previous prime is 18991441193. The next prime is 18991441253. The reversal of 18991441223 is 32214419981.

It is an interprime number because it is at equal distance from previous prime (18991441193) and next prime (18991441253).

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 18991441223 - 2⁸ = 18991440967 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 (18991441253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76103 + ... + 209223.

It is an arithmetic number, because the mean of its divisors is an integer number (2390205510).

Almost surely, 2^18991441223 is an apocalyptic number.

18991441223 is a deficient number, since it is larger than the sum of its proper divisors (130202857).

18991441223 is a wasteful number, since it uses less digits than its factorization.

18991441223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134097.

The product of its digits is 124416, while the sum is 44.

The spelling of 18991441223 in words is "eighteen billion, nine hundred ninety-one million, four hundred forty-one thousand, two hundred twenty-three".