131240441665 has 4 divisors (see below), whose sum is σ = 157488530004. Its totient is φ = 104992353328.

The previous prime is 131240441639. The next prime is 131240441687. The reversal of 131240441665 is 566144042131.

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 47778965056 + 83461476609 = 218584^2 + 288897^2 .

It is a cyclic number.

It is not a de Polignac number, because 131240441665 - 2¹³ = 131240433473 is a prime.

It is a Duffinian number.

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, 13124044162 + ... + 13124044171.

It is an arithmetic number, because the mean of its divisors is an integer number (39372132501).

Almost surely, 2^131240441665 is an apocalyptic number.

It is an amenable number.

131240441665 is a deficient number, since it is larger than the sum of its proper divisors (26248088339).

131240441665 is an equidigital number, since it uses as much as digits as its factorization.

131240441665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26248088338.

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 131240441665 its reverse (566144042131), we get a palindrome (697384483796).

The spelling of 131240441665 in words is "one hundred thirty-one billion, two hundred forty million, four hundred forty-one thousand, six hundred sixty-five".