197166661791 has 32 divisors (see below), whose sum is σ = 290577715200. Its totient is φ = 117917510880.

The previous prime is 197166661721. The next prime is 197166661829.

197166661791 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 197166661791 - 2¹¹ = 197166659743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197166661711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4951720 + ... + 4991378.

It is an arithmetic number, because the mean of its divisors is an integer number (9080553600).

Almost surely, 2^197166661791 is an apocalyptic number.

197166661791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

197166661791 is a deficient number, since it is larger than the sum of its proper divisors (93411053409).

197166661791 is a wasteful number, since it uses less digits than its factorization.

197166661791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41659.

The product of its digits is 5143824, while the sum is 60.

The spelling of 197166661791 in words is "one hundred ninety-seven billion, one hundred sixty-six million, six hundred sixty-one thousand, seven hundred ninety-one".