19555784953 has 2 divisors, whose sum is σ = 19555784954. Its totient is φ = 19555784952.

The previous prime is 19555784917. The next prime is 19555784987. The reversal of 19555784953 is 35948755591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18221490169 + 1334294784 = 134987^2 + 36528^2 .

It is a cyclic number.

It is not a de Polignac number, because 19555784953 - 2⁹ = 19555784441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19555784891 and 19555784900.

It is not a weakly prime, because it can be changed into another prime (19555781953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9777892476 + 9777892477.

It is an arithmetic number, because the mean of its divisors is an integer number (9777892477).

Almost surely, 2^19555784953 is an apocalyptic number.

It is an amenable number.

19555784953 is a deficient number, since it is larger than the sum of its proper divisors (1).

19555784953 is an equidigital number, since it uses as much as digits as its factorization.

19555784953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020000, while the sum is 61.

The spelling of 19555784953 in words is "nineteen billion, five hundred fifty-five million, seven hundred eighty-four thousand, nine hundred fifty-three".