131611663177 has 4 divisors (see below), whose sum is σ = 136149996420. Its totient is φ = 127073329936.

The previous prime is 131611663171. The next prime is 131611663181. The reversal of 131611663177 is 771366116131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71757551376 + 59854111801 = 267876^2 + 244651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131611663177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131611663171) 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 3 ways as a sum of consecutive naturals, for example, 2269166578 + ... + 2269166635.

It is an arithmetic number, because the mean of its divisors is an integer number (34037499105).

Almost surely, 2^131611663177 is an apocalyptic number.

It is an amenable number.

131611663177 is a deficient number, since it is larger than the sum of its proper divisors (4538333243).

131611663177 is an equidigital number, since it uses as much as digits as its factorization.

131611663177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4538333242.

The product of its digits is 95256, while the sum is 43.

The spelling of 131611663177 in words is "one hundred thirty-one billion, six hundred eleven million, six hundred sixty-three thousand, one hundred seventy-seven".