18419944923 has 12 divisors (see below), whose sum is σ = 26608101520. Its totient is φ = 12279264336.

The previous prime is 18419944903. The next prime is 18419944927. The reversal of 18419944923 is 32944991481.

18419944923 is a `hidden beast` number, since 1 + 8 + 4 + 199 + 449 + 2 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-18419944923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18419944923.

It is not an unprimeable number, because it can be changed into a prime (18419944927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146565 + ... + 241497.

Almost surely, 2^18419944923 is an apocalyptic number.

18419944923 is a deficient number, since it is larger than the sum of its proper divisors (8188156597).

18419944923 is a wasteful number, since it uses less digits than its factorization.

18419944923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116498 (or 116495 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The spelling of 18419944923 in words is "eighteen billion, four hundred nineteen million, nine hundred forty-four thousand, nine hundred twenty-three".