56564821373 has 2 divisors, whose sum is σ = 56564821374. Its totient is φ = 56564821372.

The previous prime is 56564821351. The next prime is 56564821447. The reversal of 56564821373 is 37312846565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56314612249 + 250209124 = 237307^2 + 15818^2 .

It is a cyclic number.

It is not a de Polignac number, because 56564821373 - 2¹⁰ = 56564820349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56564821343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28282410686 + 28282410687.

It is an arithmetic number, because the mean of its divisors is an integer number (28282410687).

Almost surely, 2^56564821373 is an apocalyptic number.

It is an amenable number.

56564821373 is a deficient number, since it is larger than the sum of its proper divisors (1).

56564821373 is an equidigital number, since it uses as much as digits as its factorization.

56564821373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3628800, while the sum is 50.

The spelling of 56564821373 in words is "fifty-six billion, five hundred sixty-four million, eight hundred twenty-one thousand, three hundred seventy-three".