56781694289 has 2 divisors, whose sum is σ = 56781694290. Its totient is φ = 56781694288.

The previous prime is 56781694259. The next prime is 56781694297. The reversal of 56781694289 is 98249618765.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45953210689 + 10828483600 = 214367^2 + 104060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56781694289 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 (56781694259) 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, 28390847144 + 28390847145.

It is an arithmetic number, because the mean of its divisors is an integer number (28390847145).

Almost surely, 2^56781694289 is an apocalyptic number.

It is an amenable number.

56781694289 is a deficient number, since it is larger than the sum of its proper divisors (1).

56781694289 is an equidigital number, since it uses as much as digits as its factorization.

56781694289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52254720, while the sum is 65.

The spelling of 56781694289 in words is "fifty-six billion, seven hundred eighty-one million, six hundred ninety-four thousand, two hundred eighty-nine".