18199720857600 has 936 divisors, whose sum is σ = 70218508918272. Its totient is φ = 4492335513600.

The previous prime is 18199720857559. The next prime is 18199720857607. The reversal of 18199720857600 is 675802799181.

18199720857600 is a `hidden beast` number, since 1 + 8 + 19 + 9 + 7 + 2 + 0 + 8 + 5 + 7 + 600 = 666.

It is not an unprimeable number, because it can be changed into a prime (18199720857607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 657086952 + ... + 657114648.

Almost surely, 2^{18199720857600} is an apocalyptic number.

18199720857600 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 18199720857600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35109254459136).

18199720857600 is an abundant number, since it is smaller than the sum of its proper divisors (52018788060672).

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

18199720857600 is a wasteful number, since it uses less digits than its factorization.

18199720857600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27791 (or 27761 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 63.

The spelling of 18199720857600 in words is "eighteen trillion, one hundred ninety-nine billion, seven hundred twenty million, eight hundred fifty-seven thousand, six hundred".