18801347189 has 2 divisors, whose sum is σ = 18801347190. Its totient is φ = 18801347188.

The previous prime is 18801347179. The next prime is 18801347239. The reversal of 18801347189 is 98174310881.

It is an a-pointer prime, because the next prime (18801347239) can be obtained adding 18801347189 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14984208100 + 3817139089 = 122410^2 + 61783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18801347189 is a prime.

It is a super-2 number, since 2×18801347189² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18801347119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9400673594 + 9400673595.

It is an arithmetic number, because the mean of its divisors is an integer number (9400673595).

Almost surely, 2^18801347189 is an apocalyptic number.

It is an amenable number.

18801347189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18801347189 is an equidigital number, since it uses as much as digits as its factorization.

18801347189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 50.

The spelling of 18801347189 in words is "eighteen billion, eight hundred one million, three hundred forty-seven thousand, one hundred eighty-nine".