19418449451 has 2 divisors, whose sum is σ = 19418449452. Its totient is φ = 19418449450.

The previous prime is 19418449447. The next prime is 19418449469. The reversal of 19418449451 is 15494481491.

It is a weak prime.

It is an emirp because it is prime and its reverse (15494481491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19418449451 - 2² = 19418449447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19418449451.

It is not a weakly prime, because it can be changed into another prime (19418449481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9709224725 + 9709224726.

It is an arithmetic number, because the mean of its divisors is an integer number (9709224726).

Almost surely, 2^19418449451 is an apocalyptic number.

19418449451 is a deficient number, since it is larger than the sum of its proper divisors (1).

19418449451 is an equidigital number, since it uses as much as digits as its factorization.

19418449451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 50.

The spelling of 19418449451 in words is "nineteen billion, four hundred eighteen million, four hundred forty-nine thousand, four hundred fifty-one".