6640256615 has 16 divisors (see below), whose sum is σ = 8264717280. Its totient is φ = 5117443200.

The previous prime is 6640256573. The next prime is 6640256621. The reversal of 6640256615 is 5166520466.

It is not a de Polignac number, because 6640256615 - 2¹² = 6640252519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159005 + ... + 196374.

It is an arithmetic number, because the mean of its divisors is an integer number (516544830).

Almost surely, 2^6640256615 is an apocalyptic number.

6640256615 is a deficient number, since it is larger than the sum of its proper divisors (1624460665).

6640256615 is a wasteful number, since it uses less digits than its factorization.

6640256615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355522.

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 6640256615 is about 81487.7697265056. The cubic root of 6640256615 is about 1879.5834876859.

The spelling of 6640256615 in words is "six billion, six hundred forty million, two hundred fifty-six thousand, six hundred fifteen".