12938665449 has 16 divisors (see below), whose sum is σ = 17487617472. Its totient is φ = 8508438528.

The previous prime is 12938665447. The next prime is 12938665547. The reversal of 12938665449 is 94456683921.

12938665449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12938665449 - 2¹ = 12938665447 is a prime.

It is a super-2 number, since 2×12938665449² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12938665447) 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 15 ways as a sum of consecutive naturals, for example, 11704 + ... + 161289.

It is an arithmetic number, because the mean of its divisors is an integer number (1092976092).

Almost surely, 2^12938665449 is an apocalyptic number.

It is an amenable number.

12938665449 is a deficient number, since it is larger than the sum of its proper divisors (4548952023).

12938665449 is a wasteful number, since it uses less digits than its factorization.

12938665449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173336.

The product of its digits is 11197440, while the sum is 57.

The spelling of 12938665449 in words is "twelve billion, nine hundred thirty-eight million, six hundred sixty-five thousand, four hundred forty-nine".