18205680100 has 18 divisors (see below), whose sum is σ = 39506326034. Its totient is φ = 7282272000.

The previous prime is 18205680071. The next prime is 18205680121. The reversal of 18205680100 is 108650281.

It can be written as a sum of positive squares in 3 ways, for example, as 14684224 + 18190995876 = 3832^2 + 134874^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91028301 + ... + 91028500.

Almost surely, 2^18205680100 is an apocalyptic number.

18205680100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18205680100 is an abundant number, since it is smaller than the sum of its proper divisors (21300645934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18205680100 is a wasteful number, since it uses less digits than its factorization.

18205680100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182056815 (or 182056808 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The spelling of 18205680100 in words is "eighteen billion, two hundred five million, six hundred eighty thousand, one hundred".