12781175738 has 4 divisors (see below), whose sum is σ = 19171763610. Its totient is φ = 6390587868.

The previous prime is 12781175717. The next prime is 12781175857. The reversal of 12781175738 is 83757118721.

12781175738 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7813322449 + 4967853289 = 88393^2 + 70483^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195293933 + ... + 3195293936.

Almost surely, 2^12781175738 is an apocalyptic number.

12781175738 is a deficient number, since it is larger than the sum of its proper divisors (6390587872).

12781175738 is an equidigital number, since it uses as much as digits as its factorization.

12781175738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6390587871.

The product of its digits is 658560, while the sum is 50.

The spelling of 12781175738 in words is "twelve billion, seven hundred eighty-one million, one hundred seventy-five thousand, seven hundred thirty-eight".