18894185477849 has 16 divisors (see below), whose sum is σ = 20628153369600. Its totient is φ = 17162938607760.

The previous prime is 18894185477833. The next prime is 18894185477903. The reversal of 18894185477849 is 94877458149881.

It is not a de Polignac number, because 18894185477849 - 2⁴ = 18894185477833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18894185477149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240690884 + ... + 240769370.

It is an arithmetic number, because the mean of its divisors is an integer number (1289259585600).

Almost surely, 2^{18894185477849} is an apocalyptic number.

It is an amenable number.

18894185477849 is a deficient number, since it is larger than the sum of its proper divisors (1733967891751).

18894185477849 is a wasteful number, since it uses less digits than its factorization.

18894185477849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95540.

The product of its digits is 5202247680, while the sum is 83.

The spelling of 18894185477849 in words is "eighteen trillion, eight hundred ninety-four billion, one hundred eighty-five million, four hundred seventy-seven thousand, eight hundred forty-nine".