217942539803 has 2 divisors, whose sum is σ = 217942539804. Its totient is φ = 217942539802.

The previous prime is 217942539769. The next prime is 217942539853. The reversal of 217942539803 is 308935249712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217942539803 - 2¹⁴ = 217942523419 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (217942539853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108971269901 + 108971269902.

It is an arithmetic number, because the mean of its divisors is an integer number (108971269902).

Almost surely, 2^217942539803 is an apocalyptic number.

217942539803 is a deficient number, since it is larger than the sum of its proper divisors (1).

217942539803 is an equidigital number, since it uses as much as digits as its factorization.

217942539803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 217942539803 in words is "two hundred seventeen billion, nine hundred forty-two million, five hundred thirty-nine thousand, eight hundred three".