65666593813 has 16 divisors (see below), whose sum is σ = 67785075072. Its totient is φ = 63588672000.

The previous prime is 65666593703. The next prime is 65666593819. The reversal of 65666593813 is 31839566656.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65666593813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65666593819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1222818 + ... + 1275388.

It is an arithmetic number, because the mean of its divisors is an integer number (4236567192).

Almost surely, 2^65666593813 is an apocalyptic number.

It is an amenable number.

65666593813 is a deficient number, since it is larger than the sum of its proper divisors (2118481259).

65666593813 is a wasteful number, since it uses less digits than its factorization.

65666593813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52956.

The product of its digits is 20995200, while the sum is 58.

The spelling of 65666593813 in words is "sixty-five billion, six hundred sixty-six million, five hundred ninety-three thousand, eight hundred thirteen".