18205220450 has 12 divisors (see below), whose sum is σ = 33861710130. Its totient is φ = 7282088160.

The previous prime is 18205220419. The next prime is 18205220459. The reversal of 18205220450 is 5402250281.

It can be written as a sum of positive squares in 3 ways, for example, as 15239655601 + 2965564849 = 123449^2 + 54457^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18205220459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182052155 + ... + 182052254.

Almost surely, 2^18205220450 is an apocalyptic number.

18205220450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18205220450 is a deficient number, since it is larger than the sum of its proper divisors (15656489680).

18205220450 is a wasteful number, since it uses less digits than its factorization.

18205220450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364104421 (or 364104416 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The spelling of 18205220450 in words is "eighteen billion, two hundred five million, two hundred twenty thousand, four hundred fifty".