12605991849 has 20 divisors (see below), whose sum is σ = 20543099280. Its totient is φ = 7639994520.

The previous prime is 12605991779. The next prime is 12605991857. The reversal of 12605991849 is 94819950621.

12605991849 is a `hidden beast` number, since 1 + 2 + 6 + 0 + 599 + 1 + 8 + 49 = 666.

It is not a de Polignac number, because 12605991849 - 2¹¹ = 12605989801 is a prime.

It is a super-2 number, since 2×12605991849² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12605991795 and 12605991804.

It is not an unprimeable number, because it can be changed into a prime (12605991949) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7073179 + ... + 7074960.

It is an arithmetic number, because the mean of its divisors is an integer number (1027154964).

Almost surely, 2^12605991849 is an apocalyptic number.

It is an amenable number.

12605991849 is a deficient number, since it is larger than the sum of its proper divisors (7937107431).

12605991849 is a wasteful number, since it uses less digits than its factorization.

12605991849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14148162 (or 14148153 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 12605991849 in words is "twelve billion, six hundred five million, nine hundred ninety-one thousand, eight hundred forty-nine".