56533689809 has 2 divisors, whose sum is σ = 56533689810. Its totient is φ = 56533689808.

The previous prime is 56533689767. The next prime is 56533689841. The reversal of 56533689809 is 90898633565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56178480400 + 355209409 = 237020^2 + 18847^2 .

It is a cyclic number.

It is not a de Polignac number, because 56533689809 - 2³² = 52238722513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (56533689899) 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, 28266844904 + 28266844905.

It is an arithmetic number, because the mean of its divisors is an integer number (28266844905).

Almost surely, 2^56533689809 is an apocalyptic number.

It is an amenable number.

56533689809 is a deficient number, since it is larger than the sum of its proper divisors (1).

56533689809 is an equidigital number, since it uses as much as digits as its factorization.

56533689809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41990400, while the sum is 62.

The spelling of 56533689809 in words is "fifty-six billion, five hundred thirty-three million, six hundred eighty-nine thousand, eight hundred nine".