166321386 has 192 divisors, whose sum is σ = 479232000. Its totient is φ = 41277600.

The previous prime is 166321381. The next prime is 166321427. The reversal of 166321386 is 683123661.

166321386 is a `hidden beast` number, since 1 + 6 + 632 + 13 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 166321386.

It is not an unprimeable number, because it can be changed into a prime (166321381) 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 95 ways as a sum of consecutive naturals, for example, 2105295 + ... + 2105373.

It is an arithmetic number, because the mean of its divisors is an integer number (2496000).

Almost surely, 2^166321386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166321386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239616000).

166321386 is an abundant number, since it is smaller than the sum of its proper divisors (312910614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166321386 is a wasteful number, since it uses less digits than its factorization.

166321386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 133 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 166321386 is about 12896.5648914740. The cubic root of 166321386 is about 549.9409148650.

The spelling of 166321386 in words is "one hundred sixty-six million, three hundred twenty-one thousand, three hundred eighty-six".