56557147217 has 2 divisors, whose sum is σ = 56557147218. Its totient is φ = 56557147216.

The previous prime is 56557147211. The next prime is 56557147219. The reversal of 56557147217 is 71274175565.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30084555601 + 26472591616 = 173449^2 + 162704^2 .

It is a cyclic number.

It is not a de Polignac number, because 56557147217 - 2⁴ = 56557147201 is a prime.

Together with 56557147219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56557147211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28278573608 + 28278573609.

It is an arithmetic number, because the mean of its divisors is an integer number (28278573609).

Almost surely, 2^56557147217 is an apocalyptic number.

It is an amenable number.

56557147217 is a deficient number, since it is larger than the sum of its proper divisors (1).

56557147217 is an equidigital number, since it uses as much as digits as its factorization.

56557147217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2058000, while the sum is 50.

The spelling of 56557147217 in words is "fifty-six billion, five hundred fifty-seven million, one hundred forty-seven thousand, two hundred seventeen".