6601555500 has 96 divisors (see below), whose sum is σ = 19245757440. Its totient is φ = 1758398400.

The previous prime is 6601555483. The next prime is 6601555501. The reversal of 6601555500 is 55551066.

It is not an unprimeable number, because it can be changed into a prime (6601555501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1682541 + ... + 1686459.

It is an arithmetic number, because the mean of its divisors is an integer number (200476640).

Almost surely, 2^6601555500 is an apocalyptic number.

6601555500 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 6601555500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9622878720).

6601555500 is an abundant number, since it is smaller than the sum of its proper divisors (12644201940).

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

6601555500 is a wasteful number, since it uses less digits than its factorization.

6601555500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064 (or 5052 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 6601555500 is about 81249.9569230655. The cubic root of 6601555500 is about 1875.9248060053.

The spelling of 6601555500 in words is "six billion, six hundred one million, five hundred fifty-five thousand, five hundred".