278122611779 has 2 divisors, whose sum is σ = 278122611780. Its totient is φ = 278122611778.

The previous prime is 278122611769. The next prime is 278122611847. The reversal of 278122611779 is 977116221872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278122611779 - 2¹² = 278122607683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278122611779.

It is not a weakly prime, because it can be changed into another prime (278122611709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139061305889 + 139061305890.

It is an arithmetic number, because the mean of its divisors is an integer number (139061305890).

Almost surely, 2^278122611779 is an apocalyptic number.

278122611779 is a deficient number, since it is larger than the sum of its proper divisors (1).

278122611779 is an equidigital number, since it uses as much as digits as its factorization.

278122611779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 53.

The spelling of 278122611779 in words is "two hundred seventy-eight billion, one hundred twenty-two million, six hundred eleven thousand, seven hundred seventy-nine".