6601218420 has 96 divisors (see below), whose sum is σ = 18723519360. Its totient is φ = 1737607680.

The previous prime is 6601218391. The next prime is 6601218493. The reversal of 6601218420 is 248121066.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 1507354 + ... + 1511726.

It is an arithmetic number, because the mean of its divisors is an integer number (195036660).

Almost surely, 2^6601218420 is an apocalyptic number.

6601218420 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 6601218420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9361759680).

6601218420 is an abundant number, since it is smaller than the sum of its proper divisors (12122300940).

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

6601218420 is a wasteful number, since it uses less digits than its factorization.

6601218420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4705 (or 4703 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 6601218420 is about 81247.8825570242. The cubic root of 6601218420 is about 1875.8928767882.

Adding to 6601218420 its reverse (248121066), we get a palindrome (6849339486).

The spelling of 6601218420 in words is "six billion, six hundred one million, two hundred eighteen thousand, four hundred twenty".