12782027777 has 2 divisors, whose sum is σ = 12782027778. Its totient is φ = 12782027776.

The previous prime is 12782027749. The next prime is 12782027821. The reversal of 12782027777 is 77772028721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8043219856 + 4738807921 = 89684^2 + 68839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12782027777 - 2²² = 12777833473 is a prime.

It is not a weakly prime, because it can be changed into another prime (12782027707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6391013888 + 6391013889.

It is an arithmetic number, because the mean of its divisors is an integer number (6391013889).

Almost surely, 2^12782027777 is an apocalyptic number.

It is an amenable number.

12782027777 is a deficient number, since it is larger than the sum of its proper divisors (1).

12782027777 is an equidigital number, since it uses as much as digits as its factorization.

12782027777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1075648, while the sum is 50.

The spelling of 12782027777 in words is "twelve billion, seven hundred eighty-two million, twenty-seven thousand, seven hundred seventy-seven".