18909555190 has 8 divisors (see below), whose sum is σ = 34037199360. Its totient is φ = 7563822072.

The previous prime is 18909555187. The next prime is 18909555199. The reversal of 18909555190 is 9155590981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18909555190² (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 (18909555199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 945477750 + ... + 945477769.

It is an arithmetic number, because the mean of its divisors is an integer number (4254649920).

Almost surely, 2^18909555190 is an apocalyptic number.

18909555190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18909555190 is a deficient number, since it is larger than the sum of its proper divisors (15127644170).

18909555190 is a wasteful number, since it uses less digits than its factorization.

18909555190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1890955526.

The product of its (nonzero) digits is 729000, while the sum is 52.

The spelling of 18909555190 in words is "eighteen billion, nine hundred nine million, five hundred fifty-five thousand, one hundred ninety".