65121134663503 has 16 divisors (see below), whose sum is σ = 67570394823360. Its totient is φ = 62685475776000.

The previous prime is 65121134663479. The next prime is 65121134663573. The reversal of 65121134663503 is 30536643112156.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 65121134663503 - 2¹⁷ = 65121134532431 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 (65121134663573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182586718 + ... + 182943028.

It is an arithmetic number, because the mean of its divisors is an integer number (4223149676460).

Almost surely, 2^{65121134663503} is an apocalyptic number.

65121134663503 is a deficient number, since it is larger than the sum of its proper divisors (2449260159857).

65121134663503 is a wasteful number, since it uses less digits than its factorization.

65121134663503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375378.

The product of its (nonzero) digits is 1166400, while the sum is 46.

Adding to 65121134663503 its reverse (30536643112156), we get a palindrome (95657777775659).

The spelling of 65121134663503 in words is "sixty-five trillion, one hundred twenty-one billion, one hundred thirty-four million, six hundred sixty-three thousand, five hundred three".