131778772672517 has 8 divisors (see below), whose sum is σ = 132114841530624. Its totient is φ = 131443114408048.

The previous prime is 131778772672493. The next prime is 131778772672583. The reversal of 131778772672517 is 715276277877131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131778772672517 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 (131778772672597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102005693 + ... + 103289490.

It is an arithmetic number, because the mean of its divisors is an integer number (16514355191328).

Almost surely, 2^{131778772672517} is an apocalyptic number.

It is an amenable number.

131778772672517 is a deficient number, since it is larger than the sum of its proper divisors (336068858107).

131778772672517 is an equidigital number, since it uses as much as digits as its factorization.

131778772672517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205296819.

The product of its digits is 338829120, while the sum is 71.

The spelling of 131778772672517 in words is "one hundred thirty-one trillion, seven hundred seventy-eight billion, seven hundred seventy-two million, six hundred seventy-two thousand, five hundred seventeen".