278798652017 has 2 divisors, whose sum is σ = 278798652018. Its totient is φ = 278798652016.

The previous prime is 278798651981. The next prime is 278798652049. The reversal of 278798652017 is 710256897872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163041518656 + 115757133361 = 403784^2 + 340231^2 .

It is a cyclic number.

It is not a de Polignac number, because 278798652017 - 2⁶ = 278798651953 is a prime.

It is not a weakly prime, because it can be changed into another prime (278798652317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139399326008 + 139399326009.

It is an arithmetic number, because the mean of its divisors is an integer number (139399326009).

Almost surely, 2^278798652017 is an apocalyptic number.

It is an amenable number.

278798652017 is a deficient number, since it is larger than the sum of its proper divisors (1).

278798652017 is an equidigital number, since it uses as much as digits as its factorization.

278798652017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23708160, while the sum is 62.

The spelling of 278798652017 in words is "two hundred seventy-eight billion, seven hundred ninety-eight million, six hundred fifty-two thousand, seventeen".