6680566720464 has 480 divisors, whose sum is σ = 22049722727424. Its totient is φ = 1726960435200.

The previous prime is 6680566720441. The next prime is 6680566720547. The reversal of 6680566720464 is 4640276650866.

It is a super-2 number, since 2×6680566720464² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6680566720398 and 6680566720407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3161649072 + ... + 3161651184.

Almost surely, 2^{6680566720464} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6680566720464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11024861363712).

6680566720464 is an abundant number, since it is smaller than the sum of its proper divisors (15369156006960).

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

6680566720464 is a wasteful number, since it uses less digits than its factorization.

6680566720464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155 (or 4142 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 60.

The spelling of 6680566720464 in words is "six trillion, six hundred eighty billion, five hundred sixty-six million, seven hundred twenty thousand, four hundred sixty-four".