5561728956191 has 2 divisors, whose sum is σ = 5561728956192. Its totient is φ = 5561728956190.

The previous prime is 5561728956187. The next prime is 5561728956227. The reversal of 5561728956191 is 1916598271655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5561728956191 - 2² = 5561728956187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5561728956991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780864478095 + 2780864478096.

It is an arithmetic number, because the mean of its divisors is an integer number (2780864478096).

Almost surely, 2^{5561728956191} is an apocalyptic number.

5561728956191 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561728956191 is an equidigital number, since it uses as much as digits as its factorization.

5561728956191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824000, while the sum is 65.

The spelling of 5561728956191 in words is "five trillion, five hundred sixty-one billion, seven hundred twenty-eight million, nine hundred fifty-six thousand, one hundred ninety-one".