18853128109 has 2 divisors, whose sum is σ = 18853128110. Its totient is φ = 18853128108.

The previous prime is 18853128079. The next prime is 18853128139. The reversal of 18853128109 is 90182135881.

It is a balanced prime because it is at equal distance from previous prime (18853128079) and next prime (18853128139).

It can be written as a sum of positive squares in only one way, i.e., 11609416009 + 7243712100 = 107747^2 + 85110^2 .

It is a cyclic number.

It is not a de Polignac number, because 18853128109 - 2²⁵ = 18819573677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18853128139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9426564054 + 9426564055.

It is an arithmetic number, because the mean of its divisors is an integer number (9426564055).

Almost surely, 2^18853128109 is an apocalyptic number.

It is an amenable number.

18853128109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18853128109 is an equidigital number, since it uses as much as digits as its factorization.

18853128109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 46.

The spelling of 18853128109 in words is "eighteen billion, eight hundred fifty-three million, one hundred twenty-eight thousand, one hundred nine".