278043439349881 has 2 divisors, whose sum is σ = 278043439349882. Its totient is φ = 278043439349880.

The previous prime is 278043439349867. The next prime is 278043439349927. The reversal of 278043439349881 is 188943934340872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226914575651856 + 51128863698025 = 15063684^2 + 7150445^2 .

It is a cyclic number.

It is not a de Polignac number, because 278043439349881 - 2¹¹ = 278043439347833 is a prime.

It is a super-2 number, since 2×278043439349881² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278043439349581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139021719674940 + 139021719674941.

It is an arithmetic number, because the mean of its divisors is an integer number (139021719674941).

Almost surely, 2^{278043439349881} is an apocalyptic number.

It is an amenable number.

278043439349881 is a deficient number, since it is larger than the sum of its proper divisors (1).

278043439349881 is an equidigital number, since it uses as much as digits as its factorization.

278043439349881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1003290624, while the sum is 73.

The spelling of 278043439349881 in words is "two hundred seventy-eight trillion, forty-three billion, four hundred thirty-nine million, three hundred forty-nine thousand, eight hundred eighty-one".