12665121498481 has 9 divisors (see below), whose sum is σ = 12966665594169. Its totient is φ = 12370434319236.

The previous prime is 12665121498451. The next prime is 12665121498521. The reversal of 12665121498481 is 18489412156621.

The square root of 12665121498481 is 3558809.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 12665121498481 - 2³³ = 12656531563889 is a prime.

It is a super-2 number, since 2×12665121498481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12665121498451) 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 8 ways as a sum of consecutive naturals, for example, 152987406 + ... + 153070168.

Almost surely, 2^{12665121498481} is an apocalyptic number.

12665121498481 is the 3558809-th square number.

12665121498481 is the 1779405-th centered octagonal number.

It is an amenable number.

12665121498481 is a deficient number, since it is larger than the sum of its proper divisors (301544095688).

12665121498481 is an frugal number, since it uses more digits than its factorization.

12665121498481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165612 (or 82806 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 58.

The spelling of 12665121498481 in words is "twelve trillion, six hundred sixty-five billion, one hundred twenty-one million, four hundred ninety-eight thousand, four hundred eighty-one".