18381163464 has 112 divisors (see below), whose sum is σ = 54393363600. Its totient is φ = 5804542944.

The previous prime is 18381163457. The next prime is 18381163469. The reversal of 18381163464 is 46436118381.

18381163464 is a `hidden beast` number, since 1 + 8 + 3 + 8 + 1 + 1 + 634 + 6 + 4 = 666.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18381163469) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 27867 + ... + 193749.

Almost surely, 2^18381163464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18381163464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27196681800).

18381163464 is an abundant number, since it is smaller than the sum of its proper divisors (36012200136).

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

18381163464 is a wasteful number, since it uses less digits than its factorization.

18381163464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165926 (or 165907 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The spelling of 18381163464 in words is "eighteen billion, three hundred eighty-one million, one hundred sixty-three thousand, four hundred sixty-four".