181256304225 has 12 divisors (see below), whose sum is σ = 299677089776. Its totient is φ = 96670028880.

The previous prime is 181256304209. The next prime is 181256304233. The reversal of 181256304225 is 522403652181.

It is not a de Polignac number, because 181256304225 - 2⁴ = 181256304209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1208375287 + ... + 1208375436.

Almost surely, 2^181256304225 is an apocalyptic number.

181256304225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181256304225 is a deficient number, since it is larger than the sum of its proper divisors (118420785551).

181256304225 is a wasteful number, since it uses less digits than its factorization.

181256304225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416750736 (or 2416750731 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 181256304225 in words is "one hundred eighty-one billion, two hundred fifty-six million, three hundred four thousand, two hundred twenty-five".