181331327957 has 16 divisors (see below), whose sum is σ = 205576479360. Its totient is φ = 158558720832.

The previous prime is 181331327953. The next prime is 181331327971. The reversal of 181331327957 is 759723133181.

It is a happy number.

181331327957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 181331327957 - 2² = 181331327953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181331327953) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3401168 + ... + 3454070.

It is an arithmetic number, because the mean of its divisors is an integer number (12848529960).

Almost surely, 2^181331327957 is an apocalyptic number.

It is an amenable number.

181331327957 is a deficient number, since it is larger than the sum of its proper divisors (24245151403).

181331327957 is a wasteful number, since it uses less digits than its factorization.

181331327957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66812.

The product of its digits is 952560, while the sum is 50.

The spelling of 181331327957 in words is "one hundred eighty-one billion, three hundred thirty-one million, three hundred twenty-seven thousand, nine hundred fifty-seven".