18180450400 has 108 divisors (see below), whose sum is σ = 51629343948. Its totient is φ = 6233283840.

The previous prime is 18180450391. The next prime is 18180450401. The reversal of 18180450400 is 405408181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18180450401) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 192694 + ... + 271093.

It is an arithmetic number, because the mean of its divisors is an integer number (478049481).

Almost surely, 2^18180450400 is an apocalyptic number.

18180450400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18180450400 is an abundant number, since it is smaller than the sum of its proper divisors (33448893548).

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

18180450400 is a wasteful number, since it uses less digits than its factorization.

18180450400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463821 (or 463801 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 31.

Adding to 18180450400 its reverse (405408181), we get a palindrome (18585858581).

The spelling of 18180450400 in words is "eighteen billion, one hundred eighty million, four hundred fifty thousand, four hundred".