56811855949 has 2 divisors, whose sum is σ = 56811855950. Its totient is φ = 56811855948.

The previous prime is 56811855871. The next prime is 56811856009. The reversal of 56811855949 is 94955811865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46227150025 + 10584705924 = 215005^2 + 102882^2 .

It is a cyclic number.

It is not a de Polignac number, because 56811855949 - 2²⁹ = 56274985037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56811855649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28405927974 + 28405927975.

It is an arithmetic number, because the mean of its divisors is an integer number (28405927975).

Almost surely, 2^56811855949 is an apocalyptic number.

It is an amenable number.

56811855949 is a deficient number, since it is larger than the sum of its proper divisors (1).

56811855949 is an equidigital number, since it uses as much as digits as its factorization.

56811855949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552000, while the sum is 61.

The spelling of 56811855949 in words is "fifty-six billion, eight hundred eleven million, eight hundred fifty-five thousand, nine hundred forty-nine".