19418449447 has 2 divisors, whose sum is σ = 19418449448. Its totient is φ = 19418449446.

The previous prime is 19418449363. The next prime is 19418449451. The reversal of 19418449447 is 74494481491.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19418449447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19418449747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9709224723 + 9709224724.

It is an arithmetic number, because the mean of its divisors is an integer number (9709224724).

Almost surely, 2^19418449447 is an apocalyptic number.

19418449447 is a deficient number, since it is larger than the sum of its proper divisors (1).

19418449447 is an equidigital number, since it uses as much as digits as its factorization.

19418449447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 55.

The spelling of 19418449447 in words is "nineteen billion, four hundred eighteen million, four hundred forty-nine thousand, four hundred forty-seven".