166242697317 has 6 divisors (see below), whose sum is σ = 240128340582. Its totient is φ = 110828464872.

The previous prime is 166242697307. The next prime is 166242697333. The reversal of 166242697317 is 713796242661.

166242697317 is a `hidden beast` number, since 1 + 6 + 62 + 4 + 269 + 7 + 317 = 666.

It can be written as a sum of positive squares in only one way, i.e., 160020800676 + 6221896641 = 400026^2 + 78879^2 .

It is a de Polignac number, because none of the positive numbers 2^k-166242697317 is a prime.

It is a super-2 number, since 2×166242697317² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166242697307) 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 5 ways as a sum of consecutive naturals, for example, 9235705398 + ... + 9235705415.

It is an arithmetic number, because the mean of its divisors is an integer number (40021390097).

Almost surely, 2^166242697317 is an apocalyptic number.

It is an amenable number.

166242697317 is a deficient number, since it is larger than the sum of its proper divisors (73885643265).

166242697317 is a wasteful number, since it uses less digits than its factorization.

166242697317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18471410819 (or 18471410816 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The spelling of 166242697317 in words is "one hundred sixty-six billion, two hundred forty-two million, six hundred ninety-seven thousand, three hundred seventeen".