56856181801 has 2 divisors, whose sum is σ = 56856181802. Its totient is φ = 56856181800.

The previous prime is 56856181787. The next prime is 56856181807. The reversal of 56856181801 is 10818165865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42450421225 + 14405760576 = 206035^2 + 120024^2 .

It is a cyclic number.

It is not a de Polignac number, because 56856181801 - 2¹¹ = 56856179753 is a prime.

It is not a weakly prime, because it can be changed into another prime (56856181807) 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, 28428090900 + 28428090901.

It is an arithmetic number, because the mean of its divisors is an integer number (28428090901).

Almost surely, 2^56856181801 is an apocalyptic number.

It is an amenable number.

56856181801 is a deficient number, since it is larger than the sum of its proper divisors (1).

56856181801 is an equidigital number, since it uses as much as digits as its factorization.

56856181801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460800, while the sum is 49.

The spelling of 56856181801 in words is "fifty-six billion, eight hundred fifty-six million, one hundred eighty-one thousand, eight hundred one".