666816796 has 12 divisors (see below), whose sum is σ = 1167949552. Its totient is φ = 333116928.

The previous prime is 666816793. The next prime is 666816809. The reversal of 666816796 is 697618666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666816793) 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 3 ways as a sum of consecutive naturals, for example, 67680 + ... + 76903.

Almost surely, 2^666816796 is an apocalyptic number.

It is an amenable number.

666816796 is a deficient number, since it is larger than the sum of its proper divisors (501132756).

666816796 is a wasteful number, since it uses less digits than its factorization.

666816796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145740 (or 145738 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The square root of 666816796 is about 25822.7960531001. The cubic root of 666816796 is about 873.6460348409.

The spelling of 666816796 in words is "six hundred sixty-six million, eight hundred sixteen thousand, seven hundred ninety-six".