166971127 has 4 divisors (see below), whose sum is σ = 176792976. Its totient is φ = 157149280.

The previous prime is 166971097. The next prime is 166971131. The reversal of 166971127 is 721179661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166971127 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166971127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166911127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4910899 + ... + 4910932.

It is an arithmetic number, because the mean of its divisors is an integer number (44198244).

Almost surely, 2^166971127 is an apocalyptic number.

166971127 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

166971127 is a deficient number, since it is larger than the sum of its proper divisors (9821849).

166971127 is an equidigital number, since it uses as much as digits as its factorization.

166971127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9821848.

The product of its digits is 31752, while the sum is 40.

The square root of 166971127 is about 12921.7308051205. The cubic root of 166971127 is about 550.6561062624.

The spelling of 166971127 in words is "one hundred sixty-six million, nine hundred seventy-one thousand, one hundred twenty-seven".