217800667613 has 2 divisors, whose sum is σ = 217800667614. Its totient is φ = 217800667612.

The previous prime is 217800667559. The next prime is 217800667697. The reversal of 217800667613 is 316766008712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214010787769 + 3789879844 = 462613^2 + 61562^2 .

It is a cyclic number.

It is not a de Polignac number, because 217800667613 - 2⁶ = 217800667549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217800666613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108900333806 + 108900333807.

It is an arithmetic number, because the mean of its divisors is an integer number (108900333807).

Almost surely, 2^217800667613 is an apocalyptic number.

It is an amenable number.

217800667613 is a deficient number, since it is larger than the sum of its proper divisors (1).

217800667613 is an equidigital number, since it uses as much as digits as its factorization.

217800667613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 217800667613 in words is "two hundred seventeen billion, eight hundred million, six hundred sixty-seven thousand, six hundred thirteen".