65531544641 has 4 divisors (see below), whose sum is σ = 65584866900. Its totient is φ = 65478222384.

The previous prime is 65531544613. The next prime is 65531544677. The reversal of 65531544641 is 14644513556.

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 32409000625 + 33122544016 = 180025^2 + 181996^2 .

It is a cyclic number.

It is not a de Polignac number, because 65531544641 - 2¹⁸ = 65531282497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65531544592 and 65531544601.

It is not an unprimeable number, because it can be changed into a prime (65531544941) 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, 26659286 + ... + 26661743.

It is an arithmetic number, because the mean of its divisors is an integer number (16396216725).

Almost surely, 2^65531544641 is an apocalyptic number.

It is an amenable number.

65531544641 is a deficient number, since it is larger than the sum of its proper divisors (53322259).

65531544641 is a wasteful number, since it uses less digits than its factorization.

65531544641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53322258.

The product of its digits is 864000, while the sum is 44.

The spelling of 65531544641 in words is "sixty-five billion, five hundred thirty-one million, five hundred forty-four thousand, six hundred forty-one".