56518999973 has 2 divisors, whose sum is σ = 56518999974. Its totient is φ = 56518999972.

The previous prime is 56518999967. The next prime is 56518999987. The reversal of 56518999973 is 37999981565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56431427809 + 87572164 = 237553^2 + 9358^2 .

It is a cyclic number.

It is not a de Polignac number, because 56518999973 - 2⁸ = 56518999717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 56518999897 and 56518999906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56518999073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28259499986 + 28259499987.

It is an arithmetic number, because the mean of its divisors is an integer number (28259499987).

Almost surely, 2^56518999973 is an apocalyptic number.

It is an amenable number.

56518999973 is a deficient number, since it is larger than the sum of its proper divisors (1).

56518999973 is an equidigital number, since it uses as much as digits as its factorization.

56518999973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165337200, while the sum is 71.

The spelling of 56518999973 in words is "fifty-six billion, five hundred eighteen million, nine hundred ninety-nine thousand, nine hundred seventy-three".