19478411749 has 2 divisors, whose sum is σ = 19478411750. Its totient is φ = 19478411748.

The previous prime is 19478411747. The next prime is 19478411779. The reversal of 19478411749 is 94711487491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17696980900 + 1781430849 = 133030^2 + 42207^2 .

It is a cyclic number.

It is not a de Polignac number, because 19478411749 - 2¹ = 19478411747 is a prime.

Together with 19478411747, 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 19478411749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19478411747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9739205874 + 9739205875.

It is an arithmetic number, because the mean of its divisors is an integer number (9739205875).

Almost surely, 2^19478411749 is an apocalyptic number.

It is an amenable number.

19478411749 is a deficient number, since it is larger than the sum of its proper divisors (1).

19478411749 is an equidigital number, since it uses as much as digits as its factorization.

19478411749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 55.

The spelling of 19478411749 in words is "nineteen billion, four hundred seventy-eight million, four hundred eleven thousand, seven hundred forty-nine".