6640224660 has 72 divisors (see below), whose sum is σ = 21017767680. Its totient is φ = 1693737408.

The previous prime is 6640224629. The next prime is 6640224673. The reversal of 6640224660 is 664220466.

6640224660 is a `hidden beast` number, since 6 + 6 + 402 + 246 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 797820 + ... + 806099.

It is an arithmetic number, because the mean of its divisors is an integer number (291913440).

Almost surely, 2^6640224660 is an apocalyptic number.

6640224660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6640224660 is an abundant number, since it is smaller than the sum of its proper divisors (14377543020).

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

6640224660 is a wasteful number, since it uses less digits than its factorization.

6640224660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603957 (or 1603952 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 6640224660 is about 81487.5736539014. The cubic root of 6640224660 is about 1879.5804726324.

The spelling of 6640224660 in words is "six billion, six hundred forty million, two hundred twenty-four thousand, six hundred sixty".