12782087881 has 4 divisors (see below), whose sum is σ = 13093846164. Its totient is φ = 12470329600.

The previous prime is 12782087831. The next prime is 12782087887. The reversal of 12782087881 is 18878028721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1184736400 + 11597351481 = 34420^2 + 107691^2 .

It is a cyclic number.

It is not a de Polignac number, because 12782087881 - 2⁷ = 12782087753 is a prime.

It is a super-2 number, since 2×12782087881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12782087887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155879080 + ... + 155879161.

It is an arithmetic number, because the mean of its divisors is an integer number (3273461541).

Almost surely, 2^12782087881 is an apocalyptic number.

It is an amenable number.

12782087881 is a deficient number, since it is larger than the sum of its proper divisors (311758283).

12782087881 is an equidigital number, since it uses as much as digits as its factorization.

12782087881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311758282.

The product of its (nonzero) digits is 802816, while the sum is 52.

The spelling of 12782087881 in words is "twelve billion, seven hundred eighty-two million, eighty-seven thousand, eight hundred eighty-one".