278441217049 has 2 divisors, whose sum is σ = 278441217050. Its totient is φ = 278441217048.

The previous prime is 278441217017. The next prime is 278441217121. The reversal of 278441217049 is 940712144872.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246209478025 + 32231739024 = 496195^2 + 179532^2 .

It is a cyclic number.

It is not a de Polignac number, because 278441217049 - 2⁵ = 278441217017 is a prime.

It is a super-2 number, since 2×278441217049² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 278441216993 and 278441217011.

It is not a weakly prime, because it can be changed into another prime (278441217349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139220608524 + 139220608525.

It is an arithmetic number, because the mean of its divisors is an integer number (139220608525).

Almost surely, 2^278441217049 is an apocalyptic number.

It is an amenable number.

278441217049 is a deficient number, since it is larger than the sum of its proper divisors (1).

278441217049 is an equidigital number, since it uses as much as digits as its factorization.

278441217049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 49.

The spelling of 278441217049 in words is "two hundred seventy-eight billion, four hundred forty-one million, two hundred seventeen thousand, forty-nine".