12781459644 has 24 divisors (see below), whose sum is σ = 29833085520. Its totient is φ = 4259103744.

The previous prime is 12781459643. The next prime is 12781459661. The reversal of 12781459644 is 44695418721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781459643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133989 + ... + 208604.

It is an arithmetic number, because the mean of its divisors is an integer number (1243045230).

Almost surely, 2^12781459644 is an apocalyptic number.

It is an amenable number.

12781459644 is an abundant number, since it is smaller than the sum of its proper divisors (17051625876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12781459644 is a wasteful number, since it uses less digits than its factorization.

12781459644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345709 (or 345707 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The spelling of 12781459644 in words is "twelve billion, seven hundred eighty-one million, four hundred fifty-nine thousand, six hundred forty-four".