6656415521280 has 1920 divisors, whose sum is σ = 26482784993280. Its totient is φ = 1420213616640.

The previous prime is 6656415521269. The next prime is 6656415521291. The reversal of 6656415521280 is 821255146566.

It is an interprime number because it is at equal distance from previous prime (6656415521269) and next prime (6656415521291).

It is a tau number, because it is divible by the number of its divisors (1920).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 52412720577 + ... + 52412720703.

It is an arithmetic number, because the mean of its divisors is an integer number (13793117184).

Almost surely, 2^{6656415521280} is an apocalyptic number.

6656415521280 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 6656415521280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13241392496640).

6656415521280 is an abundant number, since it is smaller than the sum of its proper divisors (19826369472000).

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

6656415521280 is a wasteful number, since it uses less digits than its factorization.

6656415521280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 51.

The spelling of 6656415521280 in words is "six trillion, six hundred fifty-six billion, four hundred fifteen million, five hundred twenty-one thousand, two hundred eighty".