6646864560 has 160 divisors (see below), whose sum is σ = 23575491072. Its totient is φ = 1517568000.

The previous prime is 6646864489. The next prime is 6646864603. The reversal of 6646864560 is 654686466.

It is a happy number.

It is a super-3 number, since 3×6646864560³ (a number of 30 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2042935 + ... + 2046185.

Almost surely, 2^6646864560 is an apocalyptic number.

6646864560 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 6646864560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11787745536).

6646864560 is an abundant number, since it is smaller than the sum of its proper divisors (16928626512).

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

6646864560 is a wasteful number, since it uses less digits than its factorization.

6646864560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4491 (or 4485 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 51.

The square root of 6646864560 is about 81528.3052687838. The cubic root of 6646864560 is about 1880.2067601179.

The spelling of 6646864560 in words is "six billion, six hundred forty-six million, eight hundred sixty-four thousand, five hundred sixty".