12585378919 has 4 divisors (see below), whose sum is σ = 13325695344. Its totient is φ = 11845062496.

The previous prime is 12585378917. The next prime is 12585378929. The reversal of 12585378919 is 91987358521.

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: 91987358521 = 65777 ⋅1398473.

It is a cyclic number.

It is not a de Polignac number, because 12585378919 - 2¹ = 12585378917 is a prime.

It is a super-2 number, since 2×12585378919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12585378917) 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, 370158187 + ... + 370158220.

It is an arithmetic number, because the mean of its divisors is an integer number (3331423836).

Almost surely, 2^12585378919 is an apocalyptic number.

12585378919 is a deficient number, since it is larger than the sum of its proper divisors (740316425).

12585378919 is an equidigital number, since it uses as much as digits as its factorization.

12585378919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740316424.

The product of its digits is 5443200, while the sum is 58.

The spelling of 12585378919 in words is "twelve billion, five hundred eighty-five million, three hundred seventy-eight thousand, nine hundred nineteen".