131666065 has 4 divisors (see below), whose sum is σ = 157999284. Its totient is φ = 105332848.

The previous prime is 131666057. The next prime is 131666089. The reversal of 131666065 is 560666131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560666131 = 937 ⋅598363.

It can be written as a sum of positive squares in 2 ways, for example, as 36954241 + 94711824 = 6079^2 + 9732^2 .

It is a cyclic number.

It is not a de Polignac number, because 131666065 - 2³ = 131666057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131666065.

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, 13166602 + ... + 13166611.

It is an arithmetic number, because the mean of its divisors is an integer number (39499821).

Almost surely, 2^131666065 is an apocalyptic number.

It is an amenable number.

131666065 is a deficient number, since it is larger than the sum of its proper divisors (26333219).

131666065 is an equidigital number, since it uses as much as digits as its factorization.

131666065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26333218.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 131666065 is about 11474.5834347047. The cubic root of 131666065 is about 508.7346112738.

The spelling of 131666065 in words is "one hundred thirty-one million, six hundred sixty-six thousand, sixty-five".