217620858823 has 2 divisors, whose sum is σ = 217620858824. Its totient is φ = 217620858822.

The previous prime is 217620858811. The next prime is 217620858827. The reversal of 217620858823 is 328858026712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217620858823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217620858827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108810429411 + 108810429412.

It is an arithmetic number, because the mean of its divisors is an integer number (108810429412).

Almost surely, 2^217620858823 is an apocalyptic number.

217620858823 is a deficient number, since it is larger than the sum of its proper divisors (1).

217620858823 is an equidigital number, since it uses as much as digits as its factorization.

217620858823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 217620858823 in words is "two hundred seventeen billion, six hundred twenty million, eight hundred fifty-eight thousand, eight hundred twenty-three".