27961375973161 has 2 divisors, whose sum is σ = 27961375973162. Its totient is φ = 27961375973160.

The previous prime is 27961375973093. The next prime is 27961375973189. The reversal of 27961375973161 is 16137957316972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20196431473936 + 7764944499225 = 4494044^2 + 2786565^2 .

It is a cyclic number.

It is not a de Polignac number, because 27961375973161 - 2¹⁹ = 27961375448873 is a prime.

It is not a weakly prime, because it can be changed into another prime (27961375973561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13980687986580 + 13980687986581.

It is an arithmetic number, because the mean of its divisors is an integer number (13980687986581).

Almost surely, 2^{27961375973161} is an apocalyptic number.

It is an amenable number.

27961375973161 is a deficient number, since it is larger than the sum of its proper divisors (1).

27961375973161 is an equidigital number, since it uses as much as digits as its factorization.

27961375973161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90016920, while the sum is 67.

The spelling of 27961375973161 in words is "twenty-seven trillion, nine hundred sixty-one billion, three hundred seventy-five million, nine hundred seventy-three thousand, one hundred sixty-one".