278066317889 has 2 divisors, whose sum is σ = 278066317890. Its totient is φ = 278066317888.

The previous prime is 278066317877. The next prime is 278066317957. The reversal of 278066317889 is 988713660872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272032135489 + 6034182400 = 521567^2 + 77680^2 .

It is a cyclic number.

It is not a de Polignac number, because 278066317889 - 2¹⁶ = 278066252353 is a prime.

It is not a weakly prime, because it can be changed into another prime (278066317489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139033158944 + 139033158945.

It is an arithmetic number, because the mean of its divisors is an integer number (139033158945).

Almost surely, 2^278066317889 is an apocalyptic number.

It is an amenable number.

278066317889 is a deficient number, since it is larger than the sum of its proper divisors (1).

278066317889 is an equidigital number, since it uses as much as digits as its factorization.

278066317889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48771072, while the sum is 65.

The spelling of 278066317889 in words is "two hundred seventy-eight billion, sixty-six million, three hundred seventeen thousand, eight hundred eighty-nine".