18999554400000 has 1080 divisors, whose sum is σ = 71537752728288. Its totient is φ = 5014656000000.

The previous prime is 18999554399999. The next prime is 18999554400089. The reversal of 18999554400000 is 445599981.

18999554400000 is a `hidden beast` number, since 1 + 8 + 9 + 9 + 95 + 544 + 0 + 0 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1080).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 18999554400000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 6544798549 + ... + 6544801451.

Almost surely, 2^{18999554400000} is an apocalyptic number.

18999554400000 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 18999554400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35768876364144).

18999554400000 is an abundant number, since it is smaller than the sum of its proper divisors (52538198328288).

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

18999554400000 is an frugal number, since it uses more digits than its factorization.

18999554400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057 (or 3014 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

Adding to 18999554400000 its reverse (445599981), we get a palindrome (18999999999981).

The spelling of 18999554400000 in words is "eighteen trillion, nine hundred ninety-nine billion, five hundred fifty-four million, four hundred thousand".