5591721600 has 768 divisors, whose sum is σ = 22402137600. Its totient is φ = 1373552640.

The previous prime is 5591721599. The next prime is 5591721601. The reversal of 5591721600 is 61271955.

5591721600 is a `hidden beast` number, since 5 + 591 + 7 + 2 + 1 + 60 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (5591721599) and next prime (5591721601).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5591721601) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 118972777 + ... + 118972823.

It is an arithmetic number, because the mean of its divisors is an integer number (29169450).

Almost surely, 2^5591721600 is an apocalyptic number.

5591721600 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 5591721600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11201068800).

5591721600 is an abundant number, since it is smaller than the sum of its proper divisors (16810416000).

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

5591721600 is an equidigital number, since it uses as much as digits as its factorization.

5591721600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 5591721600 is about 74777.8148918514. The cubic root of 5591721600 is about 1774.9325214049.

The spelling of 5591721600 in words is "five billion, five hundred ninety-one million, seven hundred twenty-one thousand, six hundred".