6668039791565 has 16 divisors (see below), whose sum is σ = 8014916986560. Its totient is φ = 5325587957760.

The previous prime is 6668039791519. The next prime is 6668039791571. The reversal of 6668039791565 is 5651979308666.

It is not a de Polignac number, because 6668039791565 - 2¹⁴ = 6668039775181 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, 23904950 + ... + 24182280.

It is an arithmetic number, because the mean of its divisors is an integer number (500932311660).

Almost surely, 2^{6668039791565} is an apocalyptic number.

It is an amenable number.

6668039791565 is a deficient number, since it is larger than the sum of its proper divisors (1346877194995).

6668039791565 is a wasteful number, since it uses less digits than its factorization.

6668039791565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285292.

The product of its (nonzero) digits is 440899200, while the sum is 71.

The spelling of 6668039791565 in words is "six trillion, six hundred sixty-eight billion, thirty-nine million, seven hundred ninety-one thousand, five hundred sixty-five".