12781325949 has 16 divisors (see below), whose sum is σ = 19563651072. Its totient is φ = 7270860528.

The previous prime is 12781325941. The next prime is 12781326001. The reversal of 12781325949 is 94952318721.

It is not a de Polignac number, because 12781325949 - 2³ = 12781325941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781325941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1359969 + ... + 1369334.

It is an arithmetic number, because the mean of its divisors is an integer number (1222728192).

Almost surely, 2^12781325949 is an apocalyptic number.

It is an amenable number.

12781325949 is a deficient number, since it is larger than the sum of its proper divisors (6782325123).

12781325949 is a wasteful number, since it uses less digits than its factorization.

12781325949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729536.

The product of its digits is 1088640, while the sum is 51.

The spelling of 12781325949 in words is "twelve billion, seven hundred eighty-one million, three hundred twenty-five thousand, nine hundred forty-nine".