56042006809 has 2 divisors, whose sum is σ = 56042006810. Its totient is φ = 56042006808.

The previous prime is 56042006777. The next prime is 56042006837. The reversal of 56042006809 is 90860024065.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33983816409 + 22058190400 = 184347^2 + 148520^2 .

It is a cyclic number.

It is not a de Polignac number, because 56042006809 - 2⁵ = 56042006777 is a prime.

It is not a weakly prime, because it can be changed into another prime (56042006879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28021003404 + 28021003405.

It is an arithmetic number, because the mean of its divisors is an integer number (28021003405).

Almost surely, 2^56042006809 is an apocalyptic number.

It is an amenable number.

56042006809 is a deficient number, since it is larger than the sum of its proper divisors (1).

56042006809 is an equidigital number, since it uses as much as digits as its factorization.

56042006809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 56042006809 in words is "fifty-six billion, forty-two million, six thousand, eight hundred nine".