66304396791 has 6 divisors (see below), whose sum is σ = 95773017600. Its totient is φ = 44202931188.

The previous prime is 66304396783. The next prime is 66304396793. The reversal of 66304396791 is 19769340366.

66304396791 is a `hidden beast` number, since 6 + 63 + 0 + 439 + 67 + 91 = 666.

It is not a de Polignac number, because 66304396791 - 2³ = 66304396783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66304396793) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3683577591 + ... + 3683577608.

It is an arithmetic number, because the mean of its divisors is an integer number (15962169600).

Almost surely, 2^66304396791 is an apocalyptic number.

66304396791 is a deficient number, since it is larger than the sum of its proper divisors (29468620809).

66304396791 is a wasteful number, since it uses less digits than its factorization.

66304396791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367155205 (or 7367155202 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 54.

The spelling of 66304396791 in words is "sixty-six billion, three hundred four million, three hundred ninety-six thousand, seven hundred ninety-one".