217255861379 has 2 divisors, whose sum is σ = 217255861380. Its totient is φ = 217255861378.

The previous prime is 217255861357. The next prime is 217255861387. The reversal of 217255861379 is 973168552712.

217255861379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217255861379 - 2¹² = 217255857283 is a prime.

It is not a weakly prime, because it can be changed into another prime (217255861349) 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, 108627930689 + 108627930690.

It is an arithmetic number, because the mean of its divisors is an integer number (108627930690).

Almost surely, 2^217255861379 is an apocalyptic number.

217255861379 is a deficient number, since it is larger than the sum of its proper divisors (1).

217255861379 is an equidigital number, since it uses as much as digits as its factorization.

217255861379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6350400, while the sum is 56.

The spelling of 217255861379 in words is "two hundred seventeen billion, two hundred fifty-five million, eight hundred sixty-one thousand, three hundred seventy-nine".