18894661423 has 4 divisors (see below), whose sum is σ = 20612357928. Its totient is φ = 17176964920.

The previous prime is 18894661403. The next prime is 18894661427. The reversal of 18894661423 is 32416649881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18894661423 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 (18894661427) 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, 858848236 + ... + 858848257.

It is an arithmetic number, because the mean of its divisors is an integer number (5153089482).

Almost surely, 2^18894661423 is an apocalyptic number.

18894661423 is a deficient number, since it is larger than the sum of its proper divisors (1717696505).

18894661423 is a wasteful number, since it uses less digits than its factorization.

18894661423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717696504.

The product of its digits is 1990656, while the sum is 52.

The spelling of 18894661423 in words is "eighteen billion, eight hundred ninety-four million, six hundred sixty-one thousand, four hundred twenty-three".