12781338073 has 32 divisors (see below), whose sum is σ = 15718735872. Its totient is φ = 10155024000.

The previous prime is 12781338047. The next prime is 12781338121. The reversal of 12781338073 is 37083318721.

It is a cyclic number.

It is not a de Polignac number, because 12781338073 - 2⁵ = 12781338041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12781338023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 990340 + ... + 1003162.

It is an arithmetic number, because the mean of its divisors is an integer number (491210496).

Almost surely, 2^12781338073 is an apocalyptic number.

It is an amenable number.

12781338073 is a deficient number, since it is larger than the sum of its proper divisors (2937397799).

12781338073 is a wasteful number, since it uses less digits than its factorization.

12781338073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13045.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 12781338073 in words is "twelve billion, seven hundred eighty-one million, three hundred thirty-eight thousand, seventy-three".