166621333 has 8 divisors (see below), whose sum is σ = 168837120. Its totient is φ = 164419920.

The previous prime is 166621291. The next prime is 166621337. The reversal of 166621333 is 333126661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166621333 is a prime.

It is a super-2 number, since 2×166621333² = 55525337221393778, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166621295 and 166621304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166621337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20823 + ... + 27691.

It is an arithmetic number, because the mean of its divisors is an integer number (21104640).

Almost surely, 2^166621333 is an apocalyptic number.

It is an amenable number.

166621333 is a deficient number, since it is larger than the sum of its proper divisors (2215787).

166621333 is a wasteful number, since it uses less digits than its factorization.

166621333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7187.

The product of its digits is 11664, while the sum is 31.

The square root of 166621333 is about 12908.1886025887. The cubic root of 166621333 is about 550.2713074680.

Adding to 166621333 its reverse (333126661), we get a palindrome (499747994).

The spelling of 166621333 in words is "one hundred sixty-six million, six hundred twenty-one thousand, three hundred thirty-three".