12605991847 has 4 divisors (see below), whose sum is σ = 12606937560. Its totient is φ = 12605046136.

The previous prime is 12605991779. The next prime is 12605991857. The reversal of 12605991847 is 74819950621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12605991847 - 2⁷ = 12605991719 is a prime.

It is a super-2 number, since 2×12605991847² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12605991794 and 12605991803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12605991857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452572 + ... + 479617.

It is an arithmetic number, because the mean of its divisors is an integer number (3151734390).

Almost surely, 2^12605991847 is an apocalyptic number.

12605991847 is a deficient number, since it is larger than the sum of its proper divisors (945713).

12605991847 is an equidigital number, since it uses as much as digits as its factorization.

12605991847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945712.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 12605991847 in words is "twelve billion, six hundred five million, nine hundred ninety-one thousand, eight hundred forty-seven".