217647274423 has 2 divisors, whose sum is σ = 217647274424. Its totient is φ = 217647274422.

The previous prime is 217647274421. The next prime is 217647274549. The reversal of 217647274423 is 324472746712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217647274423 - 2¹ = 217647274421 is a prime.

Together with 217647274421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217647274421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108823637211 + 108823637212.

It is an arithmetic number, because the mean of its divisors is an integer number (108823637212).

Almost surely, 2^217647274423 is an apocalyptic number.

217647274423 is a deficient number, since it is larger than the sum of its proper divisors (1).

217647274423 is an equidigital number, since it uses as much as digits as its factorization.

217647274423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3161088, while the sum is 49.

The spelling of 217647274423 in words is "two hundred seventeen billion, six hundred forty-seven million, two hundred seventy-four thousand, four hundred twenty-three".