18009449161200 has 720 divisors, whose sum is σ = 74891771724000. Its totient is φ = 4098442199040.

The previous prime is 18009449161163. The next prime is 18009449161219. The reversal of 18009449161200 is 216194490081.

It is a happy number.

18009449161200 is a `hidden beast` number, since 1 + 80 + 0 + 9 + 4 + 491 + 61 + 20 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 121112496 + ... + 121261104.

Almost surely, 2^{18009449161200} is an apocalyptic number.

18009449161200 is a gapful number since it is divisible by the number (10) 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 18009449161200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37445885862000).

18009449161200 is an abundant number, since it is smaller than the sum of its proper divisors (56882322562800).

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

18009449161200 is a wasteful number, since it uses less digits than its factorization.

18009449161200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148879 (or 148855 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 18009449161200 in words is "eighteen trillion, nine billion, four hundred forty-nine million, one hundred sixty-one thousand, two hundred".