166321382 has 4 divisors (see below), whose sum is σ = 249482076. Its totient is φ = 83160690.

The previous prime is 166321381. The next prime is 166321427. The reversal of 166321382 is 283123661.

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

It is a super-2 number, since 2×166321382² = 55325604220779848, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 41580344 + ... + 41580347.

It is an arithmetic number, because the mean of its divisors is an integer number (62370519).

Almost surely, 2^166321382 is an apocalyptic number.

166321382 is a deficient number, since it is larger than the sum of its proper divisors (83160694).

166321382 is an equidigital number, since it uses as much as digits as its factorization.

166321382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83160693.

The product of its digits is 10368, while the sum is 32.

The square root of 166321382 is about 12896.5647363940. The cubic root of 166321382 is about 549.9409104563.

The spelling of 166321382 in words is "one hundred sixty-six million, three hundred twenty-one thousand, three hundred eighty-two".