231661811146 has 8 divisors (see below), whose sum is σ = 348009052644. Its totient is φ = 115658793600.

The previous prime is 231661811141. The next prime is 231661811177. The reversal of 231661811146 is 641118166132.

It can be written as a sum of positive squares in 2 ways, for example, as 218243137225 + 13418673921 = 467165^2 + 115839^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 231661811099 and 231661811108.

It is not an unprimeable number, because it can be changed into a prime (231661811141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86054305 + ... + 86056996.

Almost surely, 2^231661811146 is an apocalyptic number.

231661811146 is a deficient number, since it is larger than the sum of its proper divisors (116347241498).

231661811146 is a wasteful number, since it uses less digits than its factorization.

231661811146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172111976.

The product of its digits is 41472, while the sum is 40.

Adding to 231661811146 its reverse (641118166132), we get a palindrome (872779977278).

The spelling of 231661811146 in words is "two hundred thirty-one billion, six hundred sixty-one million, eight hundred eleven thousand, one hundred forty-six".