65121444317 has 4 divisors (see below), whose sum is σ = 65122148796. Its totient is φ = 65120739840.

The previous prime is 65121444307. The next prime is 65121444337. The reversal of 65121444317 is 71344412156.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 56932823236 + 8188621081 = 238606^2 + 90491^2 .

It is a cyclic number.

It is not a de Polignac number, because 65121444317 - 2⁴ = 65121444301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65121444307) 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, 188078 + ... + 406959.

It is an arithmetic number, because the mean of its divisors is an integer number (16280537199).

Almost surely, 2^65121444317 is an apocalyptic number.

It is an amenable number.

65121444317 is a deficient number, since it is larger than the sum of its proper divisors (704479).

65121444317 is a wasteful number, since it uses less digits than its factorization.

65121444317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704478.

The product of its digits is 80640, while the sum is 38.

The spelling of 65121444317 in words is "sixty-five billion, one hundred twenty-one million, four hundred forty-four thousand, three hundred seventeen".