18018966440844 has 36 divisors (see below), whose sum is σ = 45548072112816. Its totient is φ = 6006305114208.

The previous prime is 18018966440843. The next prime is 18018966440879. The reversal of 18018966440844 is 44804466981081.

18018966440844 is a `hidden beast` number, since 1 + 8 + 0 + 189 + 6 + 6 + 4 + 408 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (18018966440843) 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, 23147542 + ... + 23913314.

It is an arithmetic number, because the mean of its divisors is an integer number (1265224225356).

Almost surely, 2^{18018966440844} is an apocalyptic number.

It is an amenable number.

18018966440844 is an abundant number, since it is smaller than the sum of its proper divisors (27529105671972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18018966440844 is a wasteful number, since it uses less digits than its factorization.

18018966440844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419406 (or 1419401 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 63.

The spelling of 18018966440844 in words is "eighteen trillion, eighteen billion, nine hundred sixty-six million, four hundred forty thousand, eight hundred forty-four".