18009164646 has 80 divisors (see below), whose sum is σ = 44426756880. Its totient is φ = 5407197120.

The previous prime is 18009164587. The next prime is 18009164647. The reversal of 18009164646 is 64646190081.

18009164646 is a `hidden beast` number, since 180 + 0 + 9 + 1 + 6 + 464 + 6 = 666.

It is a super-2 number, since 2×18009164646² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18009164647) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 147880 + ... + 240596.

It is an arithmetic number, because the mean of its divisors is an integer number (555334461).

Almost surely, 2^18009164646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18009164646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22213378440).

18009164646 is an abundant number, since it is smaller than the sum of its proper divisors (26417592234).

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

18009164646 is a wasteful number, since it uses less digits than its factorization.

18009164646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92851 (or 92842 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 18009164646 in words is "eighteen billion, nine million, one hundred sixty-four thousand, six hundred forty-six".