131566381055 has 4 divisors (see below), whose sum is σ = 157879657272. Its totient is φ = 105253104840.

The previous prime is 131566381031. The next prime is 131566381057. The reversal of 131566381055 is 550183665131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550183665131 = 83 ⋅6628718857.

It is not a de Polignac number, because 131566381055 - 2¹² = 131566376959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131566380997 and 131566381015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131566381057) 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, 13156638101 + ... + 13156638110.

It is an arithmetic number, because the mean of its divisors is an integer number (39469914318).

Almost surely, 2^131566381055 is an apocalyptic number.

131566381055 is a deficient number, since it is larger than the sum of its proper divisors (26313276217).

131566381055 is an equidigital number, since it uses as much as digits as its factorization.

131566381055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26313276216.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 131566381055 in words is "one hundred thirty-one billion, five hundred sixty-six million, three hundred eighty-one thousand, fifty-five".