56097880781 has 2 divisors, whose sum is σ = 56097880782. Its totient is φ = 56097880780.

The previous prime is 56097880777. The next prime is 56097880789. The reversal of 56097880781 is 18708879065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37593719881 + 18504160900 = 193891^2 + 136030^2 .

It is a cyclic number.

It is not a de Polignac number, because 56097880781 - 2² = 56097880777 is a prime.

It is a super-2 number, since 2×56097880781² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56097880781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56097880789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28048940390 + 28048940391.

It is an arithmetic number, because the mean of its divisors is an integer number (28048940391).

Almost surely, 2^56097880781 is an apocalyptic number.

It is an amenable number.

56097880781 is a deficient number, since it is larger than the sum of its proper divisors (1).

56097880781 is an equidigital number, since it uses as much as digits as its factorization.

56097880781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6773760, while the sum is 59.

The spelling of 56097880781 in words is "fifty-six billion, ninety-seven million, eight hundred eighty thousand, seven hundred eighty-one".