217423085279 has 2 divisors, whose sum is σ = 217423085280. Its totient is φ = 217423085278.

The previous prime is 217423085273. The next prime is 217423085357. The reversal of 217423085279 is 972580324712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217423085279 - 2⁸ = 217423085023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217423085273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108711542639 + 108711542640.

It is an arithmetic number, because the mean of its divisors is an integer number (108711542640).

Almost surely, 2^217423085279 is an apocalyptic number.

217423085279 is a deficient number, since it is larger than the sum of its proper divisors (1).

217423085279 is an equidigital number, since it uses as much as digits as its factorization.

217423085279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 217423085279 in words is "two hundred seventeen billion, four hundred twenty-three million, eighty-five thousand, two hundred seventy-nine".