56666677709 has 2 divisors, whose sum is σ = 56666677710. Its totient is φ = 56666677708.

The previous prime is 56666677687. The next prime is 56666677877. The reversal of 56666677709 is 90777666665.

56666677709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40012000900 + 16654676809 = 200030^2 + 129053^2 .

It is a cyclic number.

It is not a de Polignac number, because 56666677709 - 2⁸ = 56666677453 is a prime.

It is a super-2 number, since 2×56666677709² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56666667709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333338854 + 28333338855.

It is an arithmetic number, because the mean of its divisors is an integer number (28333338855).

Almost surely, 2^56666677709 is an apocalyptic number.

It is an amenable number.

56666677709 is a deficient number, since it is larger than the sum of its proper divisors (1).

56666677709 is an equidigital number, since it uses as much as digits as its factorization.

56666677709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120022560, while the sum is 65.

The spelling of 56666677709 in words is "fifty-six billion, six hundred sixty-six million, six hundred seventy-seven thousand, seven hundred nine".