1561061271023 has 2 divisors, whose sum is σ = 1561061271024. Its totient is φ = 1561061271022.

The previous prime is 1561061270981. The next prime is 1561061271041. The reversal of 1561061271023 is 3201721601651.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1561061271023 - 2⁶ = 1561061270959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561061271223) 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, 780530635511 + 780530635512.

It is an arithmetic number, because the mean of its divisors is an integer number (780530635512).

Almost surely, 2^{1561061271023} is an apocalyptic number.

1561061271023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561061271023 is an equidigital number, since it uses as much as digits as its factorization.

1561061271023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

Adding to 1561061271023 its reverse (3201721601651), we get a palindrome (4762782872674).

The spelling of 1561061271023 in words is "one trillion, five hundred sixty-one billion, sixty-one million, two hundred seventy-one thousand, twenty-three".