18109909910 has 16 divisors (see below), whose sum is σ = 32599529136. Its totient is φ = 7243588128.

The previous prime is 18109909903. The next prime is 18109909913. The reversal of 18109909910 is 1990990181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109909913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237329 + ... + 304211.

It is an arithmetic number, because the mean of its divisors is an integer number (2037470571).

Almost surely, 2^18109909910 is an apocalyptic number.

18109909910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18109909910 is a deficient number, since it is larger than the sum of its proper divisors (14489619226).

18109909910 is a wasteful number, since it uses less digits than its factorization.

18109909910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93967.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 18109909910 in words is "eighteen billion, one hundred nine million, nine hundred nine thousand, nine hundred ten".