19913655329 has 4 divisors (see below), whose sum is σ = 19925674884. Its totient is φ = 19901635776.

The previous prime is 19913655319. The next prime is 19913655331. The reversal of 19913655329 is 92355631991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10879533025 + 9034122304 = 104305^2 + 95048^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19913655329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19913655319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6007292 + ... + 6010605.

It is an arithmetic number, because the mean of its divisors is an integer number (4981418721).

Almost surely, 2^19913655329 is an apocalyptic number.

It is an amenable number.

19913655329 is a deficient number, since it is larger than the sum of its proper divisors (12019555).

19913655329 is a wasteful number, since it uses less digits than its factorization.

19913655329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12019554.

The product of its digits is 1968300, while the sum is 53.

The spelling of 19913655329 in words is "nineteen billion, nine hundred thirteen million, six hundred fifty-five thousand, three hundred twenty-nine".