18994411783 has 4 divisors (see below), whose sum is σ = 19182475368. Its totient is φ = 18806348200.

The previous prime is 18994411781. The next prime is 18994411811. The reversal of 18994411783 is 38711449981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38711449981 = 31 ⋅1248756451.

It is a cyclic number.

It is not a de Polignac number, because 18994411783 - 2¹ = 18994411781 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 (18994411781) 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 3 ways as a sum of consecutive naturals, for example, 94031641 + ... + 94031842.

It is an arithmetic number, because the mean of its divisors is an integer number (4795618842).

Almost surely, 2^18994411783 is an apocalyptic number.

18994411783 is a deficient number, since it is larger than the sum of its proper divisors (188063585).

18994411783 is a wasteful number, since it uses less digits than its factorization.

18994411783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188063584.

The product of its digits is 1741824, while the sum is 55.

The spelling of 18994411783 in words is "eighteen billion, nine hundred ninety-four million, four hundred eleven thousand, seven hundred eighty-three".