18919755909 has 24 divisors (see below), whose sum is σ = 28580385600. Its totient is φ = 12037842432.

The previous prime is 18919755871. The next prime is 18919755919. The reversal of 18919755909 is 90955791981.

It is not a de Polignac number, because 18919755909 - 2⁷ = 18919755781 is a prime.

It is a super-2 number, since 2×18919755909² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18919755919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8839 + ... + 194724.

It is an arithmetic number, because the mean of its divisors is an integer number (1190849400).

Almost surely, 2^18919755909 is an apocalyptic number.

It is an amenable number.

18919755909 is a deficient number, since it is larger than the sum of its proper divisors (9660629691).

18919755909 is a wasteful number, since it uses less digits than its factorization.

18919755909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204041 (or 204038 counting only the distinct ones).

The product of its (nonzero) digits is 9185400, while the sum is 63.

The spelling of 18919755909 in words is "eighteen billion, nine hundred nineteen million, seven hundred fifty-five thousand, nine hundred nine".