19785465913 has 2 divisors, whose sum is σ = 19785465914. Its totient is φ = 19785465912.

The previous prime is 19785465907. The next prime is 19785465937. The reversal of 19785465913 is 31956458791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17946085369 + 1839380544 = 133963^2 + 42888^2 .

It is a cyclic number.

It is not a de Polignac number, because 19785465913 - 2²⁵ = 19751911481 is a prime.

It is a super-2 number, since 2×19785465913² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19785465983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9892732956 + 9892732957.

It is an arithmetic number, because the mean of its divisors is an integer number (9892732957).

Almost surely, 2^19785465913 is an apocalyptic number.

It is an amenable number.

19785465913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19785465913 is an equidigital number, since it uses as much as digits as its factorization.

19785465913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8164800, while the sum is 58.

The spelling of 19785465913 in words is "nineteen billion, seven hundred eighty-five million, four hundred sixty-five thousand, nine hundred thirteen".