12520720269 has 12 divisors (see below), whose sum is σ = 19149337116. Its totient is φ = 7856138112.

The previous prime is 12520720259. The next prime is 12520720271. The reversal of 12520720269 is 96202702521.

It is a happy number.

12520720269 is a `hidden beast` number, since 1 + 2 + 520 + 72 + 0 + 2 + 69 = 666.

12520720269 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10239416100 + 2281304169 = 101190^2 + 47763^2 .

It is not a de Polignac number, because 12520720269 - 2⁴ = 12520720253 is a prime.

It is a super-2 number, since 2×12520720269² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520720259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40917234 + ... + 40917539.

It is an arithmetic number, because the mean of its divisors is an integer number (1595778093).

Almost surely, 2^12520720269 is an apocalyptic number.

It is an amenable number.

12520720269 is a deficient number, since it is larger than the sum of its proper divisors (6628616847).

12520720269 is a wasteful number, since it uses less digits than its factorization.

12520720269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81834796 (or 81834793 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 12520720269 in words is "twelve billion, five hundred twenty million, seven hundred twenty thousand, two hundred sixty-nine".