6640256072 has 16 divisors (see below), whose sum is σ = 12453795900. Its totient is φ = 3319243840.

The previous prime is 6640256071. The next prime is 6640256093. The reversal of 6640256072 is 2706520466.

It can be written as a sum of positive squares in 2 ways, for example, as 6595713796 + 44542276 = 81214^2 + 6674^2 .

It is not an unprimeable number, because it can be changed into a prime (6640256071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78047 + ... + 139182.

Almost surely, 2^6640256072 is an apocalyptic number.

It is an amenable number.

6640256072 is a deficient number, since it is larger than the sum of its proper divisors (5813539828).

6640256072 is a wasteful number, since it uses less digits than its factorization.

6640256072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221056 (or 221052 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 6640256072 is about 81487.7663947172. The cubic root of 6640256072 is about 1879.5834364522.

The spelling of 6640256072 in words is "six billion, six hundred forty million, two hundred fifty-six thousand, seventy-two".