18131725805 has 8 divisors (see below), whose sum is σ = 21769234944. Its totient is φ = 14497938000.

The previous prime is 18131725789. The next prime is 18131725837. The reversal of 18131725805 is 50852713181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18131725805 - 2⁴ = 18131725789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 919601 + ... + 939110.

It is an arithmetic number, because the mean of its divisors is an integer number (2721154368).

Almost surely, 2^18131725805 is an apocalyptic number.

It is an amenable number.

18131725805 is a deficient number, since it is larger than the sum of its proper divisors (3637509139).

18131725805 is a wasteful number, since it uses less digits than its factorization.

18131725805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860667.

The product of its (nonzero) digits is 67200, while the sum is 41.

The spelling of 18131725805 in words is "eighteen billion, one hundred thirty-one million, seven hundred twenty-five thousand, eight hundred five".