11998522800 has 720 divisors, whose sum is σ = 49220421120. Its totient is φ = 2674944000.

The previous prime is 11998522799. The next prime is 11998522817. The reversal of 11998522800 is 822589911.

11998522800 is a `hidden beast` number, since 119 + 9 + 8 + 522 + 8 + 0 + 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 an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 27838585 + ... + 27839015.

It is an arithmetic number, because the mean of its divisors is an integer number (68361696).

Almost surely, 2^11998522800 is an apocalyptic number.

11998522800 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 11998522800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24610210560).

11998522800 is an abundant number, since it is smaller than the sum of its proper divisors (37221898320).

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

11998522800 is a wasteful number, since it uses less digits than its factorization.

11998522800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The spelling of 11998522800 in words is "eleven billion, nine hundred ninety-eight million, five hundred twenty-two thousand, eight hundred".