56991426307169 has 2 divisors, whose sum is σ = 56991426307170. Its totient is φ = 56991426307168.

The previous prime is 56991426307093. The next prime is 56991426307213. The reversal of 56991426307169 is 96170362419965.

56991426307169 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., 40463745876544 + 16527680430625 = 6361112^2 + 4065425^2 .

It is a cyclic number.

It is not a de Polignac number, because 56991426307169 - 2³⁶ = 56922706830433 is a prime.

It is a super-2 number, since 2×56991426307169² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56991426307099 and 56991426307108.

It is not a weakly prime, because it can be changed into another prime (56991426307769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28495713153584 + 28495713153585.

It is an arithmetic number, because the mean of its divisors is an integer number (28495713153585).

Almost surely, 2^{56991426307169} is an apocalyptic number.

It is an amenable number.

56991426307169 is a deficient number, since it is larger than the sum of its proper divisors (1).

56991426307169 is an equidigital number, since it uses as much as digits as its factorization.

56991426307169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132269760, while the sum is 68.

The spelling of 56991426307169 in words is "fifty-six trillion, nine hundred ninety-one billion, four hundred twenty-six million, three hundred seven thousand, one hundred sixty-nine".