12669453949 has 6 divisors (see below), whose sum is σ = 13458555194. Its totient is φ = 11924191680.

The previous prime is 12669453947. The next prime is 12669453961. The reversal of 12669453949 is 94935496621.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8460688324 + 4208765625 = 91982^2 + 64875^2 .

It is not a de Polignac number, because 12669453949 - 2¹ = 12669453947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12669453893 and 12669453902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12669453943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21919182 + ... + 21919759.

Almost surely, 2^12669453949 is an apocalyptic number.

It is an amenable number.

12669453949 is a deficient number, since it is larger than the sum of its proper divisors (789101245).

12669453949 is an equidigital number, since it uses as much as digits as its factorization.

12669453949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43838975 (or 43838958 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 58.

The spelling of 12669453949 in words is "twelve billion, six hundred sixty-nine million, four hundred fifty-three thousand, nine hundred forty-nine".