6601551640320 has 1152 divisors, whose sum is σ = 27335102054400. Its totient is φ = 1347815669760.

The previous prime is 6601551640231. The next prime is 6601551640357. The reversal of 6601551640320 is 230461551066.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 530793142 + ... + 530805578.

It is an arithmetic number, because the mean of its divisors is an integer number (23728387200).

Almost surely, 2^{6601551640320} is an apocalyptic number.

6601551640320 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 6601551640320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13667551027200).

6601551640320 is an abundant number, since it is smaller than the sum of its proper divisors (20733550414080).

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

6601551640320 is a wasteful number, since it uses less digits than its factorization.

6601551640320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12526 (or 12498 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 6601551640320 in words is "six trillion, six hundred one billion, five hundred fifty-one million, six hundred forty thousand, three hundred twenty".