56121980791 has 2 divisors, whose sum is σ = 56121980792. Its totient is φ = 56121980790.

The previous prime is 56121980671. The next prime is 56121980819. The reversal of 56121980791 is 19708912165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56121980791 - 2¹¹ = 56121978743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56121980191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28060990395 + 28060990396.

It is an arithmetic number, because the mean of its divisors is an integer number (28060990396).

Almost surely, 2^56121980791 is an apocalyptic number.

56121980791 is a deficient number, since it is larger than the sum of its proper divisors (1).

56121980791 is an equidigital number, since it uses as much as digits as its factorization.

56121980791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 49.

The spelling of 56121980791 in words is "fifty-six billion, one hundred twenty-one million, nine hundred eighty thousand, seven hundred ninety-one".