1668685033 has 8 divisors (see below), whose sum is σ = 1686290760. Its totient is φ = 1651121280.

The previous prime is 1668685001. The next prime is 1668685063. The reversal of 1668685033 is 3305868661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1432809 + 1667252224 = 1197^2 + 40832^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1668685033 - 2⁵ = 1668685001 is a prime.

It is a super-3 number, since 3×1668685033³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668685063) 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 7 ways as a sum of consecutive naturals, for example, 72891 + ... + 93007.

It is an arithmetic number, because the mean of its divisors is an integer number (210786345).

Almost surely, 2^1668685033 is an apocalyptic number.

It is an amenable number.

1668685033 is a deficient number, since it is larger than the sum of its proper divisors (17605727).

1668685033 is a wasteful number, since it uses less digits than its factorization.

1668685033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20987.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 1668685033 is about 40849.5414050146. The cubic root of 1668685033 is about 1186.1095160053.

The spelling of 1668685033 in words is "one billion, six hundred sixty-eight million, six hundred eighty-five thousand, thirty-three".