1278067584161 has 2 divisors, whose sum is σ = 1278067584162. Its totient is φ = 1278067584160.

The previous prime is 1278067584089. The next prime is 1278067584163. The reversal of 1278067584161 is 1614857608721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 892941841936 + 385125742225 = 944956^2 + 620585^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278067584161 - 2¹⁰ = 1278067583137 is a prime.

Together with 1278067584163, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1278067584097 and 1278067584106.

It is not a weakly prime, because it can be changed into another prime (1278067584163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639033792080 + 639033792081.

It is an arithmetic number, because the mean of its divisors is an integer number (639033792081).

Almost surely, 2^{1278067584161} is an apocalyptic number.

It is an amenable number.

1278067584161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278067584161 is an equidigital number, since it uses as much as digits as its factorization.

1278067584161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4515840, while the sum is 56.

The spelling of 1278067584161 in words is "one trillion, two hundred seventy-eight billion, sixty-seven million, five hundred eighty-four thousand, one hundred sixty-one".