61175997689 has 2 divisors, whose sum is σ = 61175997690. Its totient is φ = 61175997688.

The previous prime is 61175997677. The next prime is 61175997697. The reversal of 61175997689 is 98679957116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31163900089 + 30012097600 = 176533^2 + 173240^2 .

It is a cyclic number.

It is not a de Polignac number, because 61175997689 - 2²⁰ = 61174949113 is a prime.

It is not a weakly prime, because it can be changed into another prime (61175997889) 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, 30587998844 + 30587998845.

It is an arithmetic number, because the mean of its divisors is an integer number (30587998845).

Almost surely, 2^61175997689 is an apocalyptic number.

It is an amenable number.

61175997689 is a deficient number, since it is larger than the sum of its proper divisors (1).

61175997689 is an equidigital number, since it uses as much as digits as its factorization.

61175997689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51438240, while the sum is 68.

The spelling of 61175997689 in words is "sixty-one billion, one hundred seventy-five million, nine hundred ninety-seven thousand, six hundred eighty-nine".