278427327779 has 2 divisors, whose sum is σ = 278427327780. Its totient is φ = 278427327778.

The previous prime is 278427327769. The next prime is 278427327859. The reversal of 278427327779 is 977723724872.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278427327779 is a prime.

It is not a weakly prime, because it can be changed into another prime (278427327709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139213663889 + 139213663890.

It is an arithmetic number, because the mean of its divisors is an integer number (139213663890).

Almost surely, 2^278427327779 is an apocalyptic number.

278427327779 is a deficient number, since it is larger than the sum of its proper divisors (1).

278427327779 is an equidigital number, since it uses as much as digits as its factorization.

278427327779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116169984, while the sum is 65.

The spelling of 278427327779 in words is "two hundred seventy-eight billion, four hundred twenty-seven million, three hundred twenty-seven thousand, seven hundred seventy-nine".