12605794591 has 4 divisors (see below), whose sum is σ = 13575471112. Its totient is φ = 11636118072.

The previous prime is 12605794589. The next prime is 12605794633. The reversal of 12605794591 is 19549750621.

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: 19549750621 = 32563 ⋅600367.

It is a cyclic number.

It is not a de Polignac number, because 12605794591 - 2¹ = 12605794589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12605791591) 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, 484838241 + ... + 484838266.

It is an arithmetic number, because the mean of its divisors is an integer number (3393867778).

Almost surely, 2^12605794591 is an apocalyptic number.

12605794591 is a deficient number, since it is larger than the sum of its proper divisors (969676521).

12605794591 is an equidigital number, since it uses as much as digits as its factorization.

12605794591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969676520.

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 12605794591 in words is "twelve billion, six hundred five million, seven hundred ninety-four thousand, five hundred ninety-one".