12781439033 has 16 divisors (see below), whose sum is σ = 14443228800. Its totient is φ = 11204014080.

The previous prime is 12781439029. The next prime is 12781439051. The reversal of 12781439033 is 33093418721.

It is a cyclic number.

It is not a de Polignac number, because 12781439033 - 2² = 12781439029 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12781439053) 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, 219260 + ... + 271362.

It is an arithmetic number, because the mean of its divisors is an integer number (902701800).

Almost surely, 2^12781439033 is an apocalyptic number.

It is an amenable number.

12781439033 is a deficient number, since it is larger than the sum of its proper divisors (1661789767).

12781439033 is a wasteful number, since it uses less digits than its factorization.

12781439033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52912.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 12781439033 in words is "twelve billion, seven hundred eighty-one million, four hundred thirty-nine thousand, thirty-three".