278210010161 has 2 divisors, whose sum is σ = 278210010162. Its totient is φ = 278210010160.

The previous prime is 278210010151. The next prime is 278210010187. The reversal of 278210010161 is 161010012872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270207634225 + 8002375936 = 519815^2 + 89456^2 .

It is a cyclic number.

It is not a de Polignac number, because 278210010161 - 2¹⁰ = 278210009137 is a prime.

It is not a weakly prime, because it can be changed into another prime (278210010151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139105005080 + 139105005081.

It is an arithmetic number, because the mean of its divisors is an integer number (139105005081).

Almost surely, 2^278210010161 is an apocalyptic number.

It is an amenable number.

278210010161 is a deficient number, since it is larger than the sum of its proper divisors (1).

278210010161 is an equidigital number, since it uses as much as digits as its factorization.

278210010161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 29.

The spelling of 278210010161 in words is "two hundred seventy-eight billion, two hundred ten million, ten thousand, one hundred sixty-one".