19518558853 has 2 divisors, whose sum is σ = 19518558854. Its totient is φ = 19518558852.

The previous prime is 19518558841. The next prime is 19518558859. The reversal of 19518558853 is 35885581591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17239164804 + 2279394049 = 131298^2 + 47743^2 .

It is an emirp because it is prime and its reverse (35885581591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19518558853 - 2⁵ = 19518558821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19518558859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9759279426 + 9759279427.

It is an arithmetic number, because the mean of its divisors is an integer number (9759279427).

Almost surely, 2^19518558853 is an apocalyptic number.

It is an amenable number.

19518558853 is a deficient number, since it is larger than the sum of its proper divisors (1).

19518558853 is an equidigital number, since it uses as much as digits as its factorization.

19518558853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640000, while the sum is 58.

The spelling of 19518558853 in words is "nineteen billion, five hundred eighteen million, five hundred fifty-eight thousand, eight hundred fifty-three".