56566171616699 has 2 divisors, whose sum is σ = 56566171616700. Its totient is φ = 56566171616698.

The previous prime is 56566171616687. The next prime is 56566171616729. The reversal of 56566171616699 is 99661617166565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56566171616699 - 2⁴ = 56566171616683 is a prime.

It is not a weakly prime, because it can be changed into another prime (56566171676699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28283085808349 + 28283085808350.

It is an arithmetic number, because the mean of its divisors is an integer number (28283085808350).

Almost surely, 2^{56566171616699} is an apocalyptic number.

56566171616699 is a deficient number, since it is larger than the sum of its proper divisors (1).

56566171616699 is an equidigital number, since it uses as much as digits as its factorization.

56566171616699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 661348800, while the sum is 74.

The spelling of 56566171616699 in words is "fifty-six trillion, five hundred sixty-six billion, one hundred seventy-one million, six hundred sixteen thousand, six hundred ninety-nine".