166666395 has 48 divisors (see below), whose sum is σ = 323723520. Its totient is φ = 72870336.

The previous prime is 166666301. The next prime is 166666399. The reversal of 166666395 is 593666661.

It is not a de Polignac number, because 166666395 - 2¹¹ = 166664347 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666399) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11976 + ... + 21834.

It is an arithmetic number, because the mean of its divisors is an integer number (6744240).

Almost surely, 2^166666395 is an apocalyptic number.

166666395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166666395 is a deficient number, since it is larger than the sum of its proper divisors (157057125).

166666395 is a wasteful number, since it uses less digits than its factorization.

166666395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9904 (or 9897 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 48.

The square root of 166666395 is about 12909.9339657490. The cubic root of 166666395 is about 550.3209091411.

The spelling of 166666395 in words is "one hundred sixty-six million, six hundred sixty-six thousand, three hundred ninety-five".