56809170685439 has 2 divisors, whose sum is σ = 56809170685440. Its totient is φ = 56809170685438.

The previous prime is 56809170685409. The next prime is 56809170685451. The reversal of 56809170685439 is 93458607190865.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56809170685439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56809170685409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28404585342719 + 28404585342720.

It is an arithmetic number, because the mean of its divisors is an integer number (28404585342720).

Almost surely, 2^{56809170685439} is an apocalyptic number.

56809170685439 is a deficient number, since it is larger than the sum of its proper divisors (1).

56809170685439 is an equidigital number, since it uses as much as digits as its factorization.

56809170685439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 391910400, while the sum is 71.

The spelling of 56809170685439 in words is "fifty-six trillion, eight hundred nine billion, one hundred seventy million, six hundred eighty-five thousand, four hundred thirty-nine".