217849263871 has 2 divisors, whose sum is σ = 217849263872. Its totient is φ = 217849263870.

The previous prime is 217849263823. The next prime is 217849263977. The reversal of 217849263871 is 178362948712.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217849263871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217849269871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108924631935 + 108924631936.

It is an arithmetic number, because the mean of its divisors is an integer number (108924631936).

Almost surely, 2^217849263871 is an apocalyptic number.

217849263871 is a deficient number, since it is larger than the sum of its proper divisors (1).

217849263871 is an equidigital number, since it uses as much as digits as its factorization.

217849263871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8128512, while the sum is 58.

The spelling of 217849263871 in words is "two hundred seventeen billion, eight hundred forty-nine million, two hundred sixty-three thousand, eight hundred seventy-one".