6621545580 has 48 divisors (see below), whose sum is σ = 19966509024. Its totient is φ = 1629918720.

The previous prime is 6621545569. The next prime is 6621545587. The reversal of 6621545580 is 855451266.

It is a super-3 number, since 3×6621545580³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6621545587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4243801 + ... + 4245360.

It is an arithmetic number, because the mean of its divisors is an integer number (415968938).

Almost surely, 2^6621545580 is an apocalyptic number.

6621545580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6621545580 is an abundant number, since it is smaller than the sum of its proper divisors (13344963444).

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

6621545580 is a wasteful number, since it uses less digits than its factorization.

6621545580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8489186 (or 8489184 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The square root of 6621545580 is about 81372.8798802156. The cubic root of 6621545580 is about 1877.8163854231.

The spelling of 6621545580 in words is "six billion, six hundred twenty-one million, five hundred forty-five thousand, five hundred eighty".