12699776449 has 4 divisors (see below), whose sum is σ = 12711460864. Its totient is φ = 12688092036.

The previous prime is 12699776443. The next prime is 12699776513. The reversal of 12699776449 is 94467799621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94467799621 = 13 ⋅7266753817.

It is a cyclic number.

It is not a de Polignac number, because 12699776449 - 2⁷ = 12699776321 is a prime.

It is a super-2 number, since 2×12699776449² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12699776443) 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, 5840577 + ... + 5842750.

It is an arithmetic number, because the mean of its divisors is an integer number (3177865216).

Almost surely, 2^12699776449 is an apocalyptic number.

It is an amenable number.

12699776449 is a deficient number, since it is larger than the sum of its proper divisors (11684415).

12699776449 is a wasteful number, since it uses less digits than its factorization.

12699776449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11684414.

The product of its digits is 41150592, while the sum is 64.

The spelling of 12699776449 in words is "twelve billion, six hundred ninety-nine million, seven hundred seventy-six thousand, four hundred forty-nine".