18955835557 has 2 divisors, whose sum is σ = 18955835558. Its totient is φ = 18955835556.

The previous prime is 18955835539. The next prime is 18955835599. The reversal of 18955835557 is 75553855981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16375297156 + 2580538401 = 127966^2 + 50799^2 .

It is an emirp because it is prime and its reverse (75553855981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18955835557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18955835495 and 18955835504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18955835527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9477917778 + 9477917779.

It is an arithmetic number, because the mean of its divisors is an integer number (9477917779).

Almost surely, 2^18955835557 is an apocalyptic number.

It is an amenable number.

18955835557 is a deficient number, since it is larger than the sum of its proper divisors (1).

18955835557 is an equidigital number, since it uses as much as digits as its factorization.

18955835557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800000, while the sum is 61.

The spelling of 18955835557 in words is "eighteen billion, nine hundred fifty-five million, eight hundred thirty-five thousand, five hundred fifty-seven".