19729496869 has 2 divisors, whose sum is σ = 19729496870. Its totient is φ = 19729496868.

The previous prime is 19729496867. The next prime is 19729496879. The reversal of 19729496869 is 96869492791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19301544900 + 427951969 = 138930^2 + 20687^2 .

It is a cyclic number.

It is not a de Polignac number, because 19729496869 - 2¹ = 19729496867 is a prime.

It is a super-2 number, since 2×19729496869² (a number of 21 digits) contains 22 as substring.

Together with 19729496867, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 19729496798 and 19729496807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19729496861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9864748434 + 9864748435.

It is an arithmetic number, because the mean of its divisors is an integer number (9864748435).

Almost surely, 2^19729496869 is an apocalyptic number.

It is an amenable number.

19729496869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19729496869 is an equidigital number, since it uses as much as digits as its factorization.

19729496869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105815808, while the sum is 70.

The spelling of 19729496869 in words is "nineteen billion, seven hundred twenty-nine million, four hundred ninety-six thousand, eight hundred sixty-nine".