131720568056 has 72 divisors (see below), whose sum is σ = 310321308360. Its totient is φ = 51308062080.

The previous prime is 131720568047. The next prime is 131720568079. The reversal of 131720568056 is 650865027131.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 131720567998 and 131720568016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 29873180 + ... + 29877588.

Almost surely, 2^131720568056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131720568056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155160654180).

131720568056 is an abundant number, since it is smaller than the sum of its proper divisors (178600740304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131720568056 is an frugal number, since it uses more digits than its factorization.

131720568056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8853 (or 4429 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 131720568056 in words is "one hundred thirty-one billion, seven hundred twenty million, five hundred sixty-eight thousand, fifty-six".