6640020615 has 16 divisors (see below), whose sum is σ = 10625077728. Its totient is φ = 3540996096.

The previous prime is 6640020613. The next prime is 6640020619. The reversal of 6640020615 is 5160200466.

It is not a de Polignac number, because 6640020615 - 2¹ = 6640020613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640020613) by changing a digit.

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, 229227 + ... + 256563.

It is an arithmetic number, because the mean of its divisors is an integer number (664067358).

Almost surely, 2^6640020615 is an apocalyptic number.

6640020615 is a deficient number, since it is larger than the sum of its proper divisors (3985057113).

6640020615 is a wasteful number, since it uses less digits than its factorization.

6640020615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43538.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 6640020615 is about 81486.3216435740. The cubic root of 6640020615 is about 1879.5612201248.

The spelling of 6640020615 in words is "six billion, six hundred forty million, twenty thousand, six hundred fifteen".