56843785991 has 2 divisors, whose sum is σ = 56843785992. Its totient is φ = 56843785990.

The previous prime is 56843785987. The next prime is 56843785993. The reversal of 56843785991 is 19958734865.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56843785991 - 2² = 56843785987 is a prime.

Together with 56843785993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56843785993) 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, 28421892995 + 28421892996.

It is an arithmetic number, because the mean of its divisors is an integer number (28421892996).

Almost surely, 2^56843785991 is an apocalyptic number.

56843785991 is a deficient number, since it is larger than the sum of its proper divisors (1).

56843785991 is an equidigital number, since it uses as much as digits as its factorization.

56843785991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65318400, while the sum is 65.

The spelling of 56843785991 in words is "fifty-six billion, eight hundred forty-three million, seven hundred eighty-five thousand, nine hundred ninety-one".