12511345439 has 4 divisors (see below), whose sum is σ = 12511776240. Its totient is φ = 12510914640.

The previous prime is 12511345417. The next prime is 12511345453. The reversal of 12511345439 is 93454311521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93454311521 = 131 ⋅713391691.

It is a cyclic number.

It is not a de Polignac number, because 12511345439 - 2¹⁶ = 12511279903 is a prime.

It is a super-2 number, since 2×12511345439² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12511345409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168422 + ... + 231059.

It is an arithmetic number, because the mean of its divisors is an integer number (3127944060).

Almost surely, 2^12511345439 is an apocalyptic number.

12511345439 is a deficient number, since it is larger than the sum of its proper divisors (430801).

12511345439 is an equidigital number, since it uses as much as digits as its factorization.

12511345439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430800.

The product of its digits is 64800, while the sum is 38.

The spelling of 12511345439 in words is "twelve billion, five hundred eleven million, three hundred forty-five thousand, four hundred thirty-nine".