6555591000 has 384 divisors, whose sum is σ = 26817298560. Its totient is φ = 1410048000.

The previous prime is 6555590999. The next prime is 6555591011. The reversal of 6555591000 is 1955556.

6555591000 is a `hidden beast` number, since 65 + 5 + 5 + 591 + 0 + 0 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1067940 + ... + 1074060.

It is an arithmetic number, because the mean of its divisors is an integer number (69836715).

Almost surely, 2^6555591000 is an apocalyptic number.

6555591000 is a gapful number since it is divisible by the number (60) 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 6555591000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13408649280).

6555591000 is an abundant number, since it is smaller than the sum of its proper divisors (20261707560).

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

6555591000 is a wasteful number, since it uses less digits than its factorization.

6555591000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6172 (or 6155 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

The square root of 6555591000 is about 80966.6042266810. The cubic root of 6555591000 is about 1871.5608423607.

The spelling of 6555591000 in words is "six billion, five hundred fifty-five million, five hundred ninety-one thousand".