19839605329 has 2 divisors, whose sum is σ = 19839605330. Its totient is φ = 19839605328.

The previous prime is 19839605327. The next prime is 19839605363. The reversal of 19839605329 is 92350693891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18554526225 + 1285079104 = 136215^2 + 35848^2 .

It is a cyclic number.

It is not a de Polignac number, because 19839605329 - 2¹ = 19839605327 is a prime.

It is a super-2 number, since 2×19839605329² (a number of 21 digits) contains 22 as substring.

Together with 19839605327, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19839605329.

It is not a weakly prime, because it can be changed into another prime (19839605327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9919802664 + 9919802665.

It is an arithmetic number, because the mean of its divisors is an integer number (9919802665).

Almost surely, 2^19839605329 is an apocalyptic number.

It is an amenable number.

19839605329 is a deficient number, since it is larger than the sum of its proper divisors (1).

19839605329 is an equidigital number, since it uses as much as digits as its factorization.

19839605329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The spelling of 19839605329 in words is "nineteen billion, eight hundred thirty-nine million, six hundred five thousand, three hundred twenty-nine".