56611869817 has 2 divisors, whose sum is σ = 56611869818. Its totient is φ = 56611869816.

The previous prime is 56611869739. The next prime is 56611869851. The reversal of 56611869817 is 71896811665.

56611869817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55405627456 + 1206242361 = 235384^2 + 34731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56611869817 is a prime.

It is a super-2 number, since 2×56611869817² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56611869617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28305934908 + 28305934909.

It is an arithmetic number, because the mean of its divisors is an integer number (28305934909).

Almost surely, 2^56611869817 is an apocalyptic number.

It is an amenable number.

56611869817 is a deficient number, since it is larger than the sum of its proper divisors (1).

56611869817 is an equidigital number, since it uses as much as digits as its factorization.

56611869817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 58.

The spelling of 56611869817 in words is "fifty-six billion, six hundred eleven million, eight hundred sixty-nine thousand, eight hundred seventeen".