1561067276491 has 2 divisors, whose sum is σ = 1561067276492. Its totient is φ = 1561067276490.

The previous prime is 1561067276477. The next prime is 1561067276557. The reversal of 1561067276491 is 1946727601651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561067276491 - 2⁹ = 1561067275979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561067276401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780533638245 + 780533638246.

It is an arithmetic number, because the mean of its divisors is an integer number (780533638246).

Almost surely, 2^{1561067276491} is an apocalyptic number.

1561067276491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561067276491 is an equidigital number, since it uses as much as digits as its factorization.

1561067276491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 1561067276491 in words is "one trillion, five hundred sixty-one billion, sixty-seven million, two hundred seventy-six thousand, four hundred ninety-one".