217608936851 has 2 divisors, whose sum is σ = 217608936852. Its totient is φ = 217608936850.

The previous prime is 217608936833. The next prime is 217608936869. The reversal of 217608936851 is 158639806712.

It is a balanced prime because it is at equal distance from previous prime (217608936833) and next prime (217608936869).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217608936851 is a prime.

It is not a weakly prime, because it can be changed into another prime (217608936451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108804468425 + 108804468426.

It is an arithmetic number, because the mean of its divisors is an integer number (108804468426).

Almost surely, 2^217608936851 is an apocalyptic number.

217608936851 is a deficient number, since it is larger than the sum of its proper divisors (1).

217608936851 is an equidigital number, since it uses as much as digits as its factorization.

217608936851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 56.

The spelling of 217608936851 in words is "two hundred seventeen billion, six hundred eight million, nine hundred thirty-six thousand, eight hundred fifty-one".