55499320800 has 1440 divisors, whose sum is σ = 258620947200. Its totient is φ = 11481523200.

The previous prime is 55499320769. The next prime is 55499320813. The reversal of 55499320800 is 802399455.

55499320800 is a `hidden beast` number, since 5 + 549 + 9 + 3 + 20 + 80 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1440).

It is a super-2 number, since 2×55499320800² (a number of 22 digits) contains 22 as substring.

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 polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 244490287 + ... + 244490513.

It is an arithmetic number, because the mean of its divisors is an integer number (179597880).

Almost surely, 2^55499320800 is an apocalyptic number.

55499320800 is a gapful number since it is divisible by the number (50) 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 55499320800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129310473600).

55499320800 is an abundant number, since it is smaller than the sum of its proper divisors (203121626400).

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

55499320800 is a wasteful number, since it uses less digits than its factorization.

55499320800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 55499320800 in words is "fifty-five billion, four hundred ninety-nine million, three hundred twenty thousand, eight hundred".