6605532780 has 288 divisors, whose sum is σ = 24460423680. Its totient is φ = 1300147200.

The previous prime is 6605532779. The next prime is 6605532811. The reversal of 6605532780 is 872355066.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 962160 + ... + 969000.

Almost surely, 2^6605532780 is an apocalyptic number.

6605532780 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 6605532780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12230211840).

6605532780 is an abundant number, since it is smaller than the sum of its proper divisors (17854890900).

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

6605532780 is a wasteful number, since it uses less digits than its factorization.

6605532780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6901 (or 6888 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The square root of 6605532780 is about 81274.4288198939. The cubic root of 6605532780 is about 1876.3014637157.

The spelling of 6605532780 in words is "six billion, six hundred five million, five hundred thirty-two thousand, seven hundred eighty".