278745853417 has 2 divisors, whose sum is σ = 278745853418. Its totient is φ = 278745853416.

The previous prime is 278745853403. The next prime is 278745853423. The reversal of 278745853417 is 714358547872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250251063001 + 28494790416 = 500251^2 + 168804^2 .

It is a cyclic number.

It is not a de Polignac number, because 278745853417 - 2³¹ = 276598369769 is a prime.

It is not a weakly prime, because it can be changed into another prime (278745853427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139372926708 + 139372926709.

It is an arithmetic number, because the mean of its divisors is an integer number (139372926709).

Almost surely, 2^278745853417 is an apocalyptic number.

It is an amenable number.

278745853417 is a deficient number, since it is larger than the sum of its proper divisors (1).

278745853417 is an equidigital number, since it uses as much as digits as its factorization.

278745853417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52684800, while the sum is 61.

The spelling of 278745853417 in words is "two hundred seventy-eight billion, seven hundred forty-five million, eight hundred fifty-three thousand, four hundred seventeen".