6660393817 has 24 divisors (see below), whose sum is σ = 8807153600. Its totient is φ = 4916751840.

The previous prime is 6660393799. The next prime is 6660393833. The reversal of 6660393817 is 7183930666.

It is not a de Polignac number, because 6660393817 - 2⁷ = 6660393689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6660390817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190842 + ... + 223027.

Almost surely, 2^6660393817 is an apocalyptic number.

It is an amenable number.

6660393817 is a deficient number, since it is larger than the sum of its proper divisors (2146759783).

6660393817 is a wasteful number, since it uses less digits than its factorization.

6660393817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413917 (or 413906 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 49.

The square root of 6660393817 is about 81611.2358502186. The cubic root of 6660393817 is about 1881.4815747688.

The spelling of 6660393817 in words is "six billion, six hundred sixty million, three hundred ninety-three thousand, eight hundred seventeen".