17994603564 has 144 divisors (see below), whose sum is σ = 57435775488. Its totient is φ = 4628473344.

The previous prime is 17994603563. The next prime is 17994603577. The reversal of 17994603564 is 46530649971.

17994603564 is a `hidden beast` number, since 1 + 7 + 99 + 460 + 35 + 64 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 17994603564.

It is not an unprimeable number, because it can be changed into a prime (17994603563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7219 + ... + 189845.

It is an arithmetic number, because the mean of its divisors is an integer number (398859552).

Almost surely, 2^17994603564 is an apocalyptic number.

17994603564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17994603564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28717887744).

17994603564 is an abundant number, since it is smaller than the sum of its proper divisors (39441171924).

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

17994603564 is a wasteful number, since it uses less digits than its factorization.

17994603564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182684 (or 182679 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 17994603564 in words is "seventeen billion, nine hundred ninety-four million, six hundred three thousand, five hundred sixty-four".