131816668181 has 8 divisors (see below), whose sum is σ = 143806601664. Its totient is φ = 119827834720.

The previous prime is 131816668141. The next prime is 131816668183. The reversal of 131816668181 is 181866618131.

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

It is a de Polignac number, because none of the positive numbers 2^k-131816668181 is a prime.

It is a super-2 number, since 2×131816668181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131816668183) 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 7 ways as a sum of consecutive naturals, for example, 13640 + ... + 513633.

It is an arithmetic number, because the mean of its divisors is an integer number (17975825208).

Almost surely, 2^131816668181 is an apocalyptic number.

131816668181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131816668181 is a deficient number, since it is larger than the sum of its proper divisors (11989933483).

131816668181 is a wasteful number, since it uses less digits than its factorization.

131816668181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550011.

The product of its digits is 331776, while the sum is 50.

It can be divided in two parts, 131816 and 668181, that added together give a palindrome (799997).

The spelling of 131816668181 in words is "one hundred thirty-one billion, eight hundred sixteen million, six hundred sixty-eight thousand, one hundred eighty-one".