208321909155313 has 2 divisors, whose sum is σ = 208321909155314. Its totient is φ = 208321909155312.

The previous prime is 208321909155271. The next prime is 208321909155377. The reversal of 208321909155313 is 313551909123802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169270195910544 + 39051713244769 = 13010388^2 + 6249137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208321909155313 is a prime.

It is a super-2 number, since 2×208321909155313² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (208381909155313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104160954577656 + 104160954577657.

It is an arithmetic number, because the mean of its divisors is an integer number (104160954577657).

Almost surely, 2^{208321909155313} is an apocalyptic number.

It is an amenable number.

208321909155313 is a deficient number, since it is larger than the sum of its proper divisors (1).

208321909155313 is an equidigital number, since it uses as much as digits as its factorization.

208321909155313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 52.

The spelling of 208321909155313 in words is "two hundred eight trillion, three hundred twenty-one billion, nine hundred nine million, one hundred fifty-five thousand, three hundred thirteen".