19650686131913 has 2 divisors, whose sum is σ = 19650686131914. Its totient is φ = 19650686131912.

The previous prime is 19650686131903. The next prime is 19650686132041. The reversal of 19650686131913 is 31913168605691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12550950023824 + 7099736108089 = 3542732^2 + 2664533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19650686131913 is a prime.

It is a super-2 number, since 2×19650686131913² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19650686131903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9825343065956 + 9825343065957.

It is an arithmetic number, because the mean of its divisors is an integer number (9825343065957).

Almost surely, 2^{19650686131913} is an apocalyptic number.

It is an amenable number.

19650686131913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19650686131913 is an equidigital number, since it uses as much as digits as its factorization.

19650686131913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6298560, while the sum is 59.

The spelling of 19650686131913 in words is "nineteen trillion, six hundred fifty billion, six hundred eighty-six million, one hundred thirty-one thousand, nine hundred thirteen".