206155503317 has 2 divisors, whose sum is σ = 206155503318. Its totient is φ = 206155503316.

The previous prime is 206155503313. The next prime is 206155503349. The reversal of 206155503317 is 713305551602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105053126161 + 101102377156 = 324119^2 + 317966^2 .

It is a cyclic number.

It is not a de Polignac number, because 206155503317 - 2² = 206155503313 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206155503313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103077751658 + 103077751659.

It is an arithmetic number, because the mean of its divisors is an integer number (103077751659).

Almost surely, 2^206155503317 is an apocalyptic number.

It is an amenable number.

206155503317 is a deficient number, since it is larger than the sum of its proper divisors (1).

206155503317 is an equidigital number, since it uses as much as digits as its factorization.

206155503317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94500, while the sum is 38.

The spelling of 206155503317 in words is "two hundred six billion, one hundred fifty-five million, five hundred three thousand, three hundred seventeen".