217384399979 has 2 divisors, whose sum is σ = 217384399980. Its totient is φ = 217384399978.

The previous prime is 217384399963. The next prime is 217384399987. The reversal of 217384399979 is 979993483712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217384399979 - 2⁴ = 217384399963 is a prime.

It is not a weakly prime, because it can be changed into another prime (217384399909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108692199989 + 108692199990.

It is an arithmetic number, because the mean of its divisors is an integer number (108692199990).

Almost surely, 2^217384399979 is an apocalyptic number.

217384399979 is a deficient number, since it is larger than the sum of its proper divisors (1).

217384399979 is an equidigital number, since it uses as much as digits as its factorization.

217384399979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 185177664, while the sum is 71.

The spelling of 217384399979 in words is "two hundred seventeen billion, three hundred eighty-four million, three hundred ninety-nine thousand, nine hundred seventy-nine".