18209221910 has 16 divisors (see below), whose sum is σ = 35756290512. Its totient is φ = 6621535200.

The previous prime is 18209221909. The next prime is 18209221993. The reversal of 18209221910 is 1912290281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82769081 + ... + 82769300.

It is an arithmetic number, because the mean of its divisors is an integer number (2234768157).

Almost surely, 2^18209221910 is an apocalyptic number.

18209221910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18209221910 is a deficient number, since it is larger than the sum of its proper divisors (17547068602).

18209221910 is a wasteful number, since it uses less digits than its factorization.

18209221910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165538399.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 18209221910 in words is "eighteen billion, two hundred nine million, two hundred twenty-one thousand, nine hundred ten".