131618721063728 has 20 divisors (see below), whose sum is σ = 255011848245480. Its totient is φ = 65809211839104.

The previous prime is 131618721063701. The next prime is 131618721063743. The reversal of 131618721063728 is 827360127816131.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1807925 + ... + 16325012.

It is an arithmetic number, because the mean of its divisors is an integer number (12750592412274).

Almost surely, 2^{131618721063728} is an apocalyptic number.

It is an amenable number.

131618721063728 is a deficient number, since it is larger than the sum of its proper divisors (123393127181752).

131618721063728 is a wasteful number, since it uses less digits than its factorization.

131618721063728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18586604 (or 18586598 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 56.

Adding to 131618721063728 its reverse (827360127816131), we get a palindrome (958978848879859).

The spelling of 131618721063728 in words is "one hundred thirty-one trillion, six hundred eighteen billion, seven hundred twenty-one million, sixty-three thousand, seven hundred twenty-eight".