18047742064 has 120 divisors (see below), whose sum is σ = 39666251376. Its totient is φ = 7886976000.

The previous prime is 18047742061. The next prime is 18047742073. The reversal of 18047742064 is 46024774081.

It is a self number, because there is not a number n which added to its sum of digits gives 18047742064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18047742061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23715444 + ... + 23716204.

Almost surely, 2^18047742064 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 18047742064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19833125688).

18047742064 is an abundant number, since it is smaller than the sum of its proper divisors (21618509312).

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

18047742064 is a wasteful number, since it uses less digits than its factorization.

18047742064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 43.

The spelling of 18047742064 in words is "eighteen billion, forty-seven million, seven hundred forty-two thousand, sixty-four".