19785239650213 has 2 divisors, whose sum is σ = 19785239650214. Its totient is φ = 19785239650212.

The previous prime is 19785239650201. The next prime is 19785239650223. The reversal of 19785239650213 is 31205693258791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18821862065889 + 963377584324 = 4338417^2 + 981518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19785239650213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19785239650223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9892619825106 + 9892619825107.

It is an arithmetic number, because the mean of its divisors is an integer number (9892619825107).

Almost surely, 2^{19785239650213} is an apocalyptic number.

It is an amenable number.

19785239650213 is a deficient number, since it is larger than the sum of its proper divisors (1).

19785239650213 is an equidigital number, since it uses as much as digits as its factorization.

19785239650213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 19785239650213 in words is "nineteen trillion, seven hundred eighty-five billion, two hundred thirty-nine million, six hundred fifty thousand, two hundred thirteen".