19355011849 has 2 divisors, whose sum is σ = 19355011850. Its totient is φ = 19355011848.

The previous prime is 19355011817. The next prime is 19355011867. The reversal of 19355011849 is 94811055391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16910401600 + 2444610249 = 130040^2 + 49443^2 .

It is a cyclic number.

It is not a de Polignac number, because 19355011849 - 2⁵ = 19355011817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19355011799 and 19355011808.

It is not a weakly prime, because it can be changed into another prime (19355111849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9677505924 + 9677505925.

It is an arithmetic number, because the mean of its divisors is an integer number (9677505925).

Almost surely, 2^19355011849 is an apocalyptic number.

It is an amenable number.

19355011849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19355011849 is an equidigital number, since it uses as much as digits as its factorization.

19355011849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 19355011849 in words is "nineteen billion, three hundred fifty-five million, eleven thousand, eight hundred forty-nine".