33661645 has 8 divisors (see below), whose sum is σ = 40465656. Its totient is φ = 26881536.

The previous prime is 33661637. The next prime is 33661699. The reversal of 33661645 is 54616633.

It can be written as a sum of positive squares in 4 ways, for example, as 2268036 + 31393609 = 1506^2 + 5603^2 .

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 33661645 - 2³ = 33661637 is a prime.

It is a super-3 number, since 3×33661645³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33661645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2712 + ... + 8641.

It is an arithmetic number, because the mean of its divisors is an integer number (5058207).

Almost surely, 2^33661645 is an apocalyptic number.

It is an amenable number.

33661645 is a deficient number, since it is larger than the sum of its proper divisors (6804011).

33661645 is a wasteful number, since it uses less digits than its factorization.

33661645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11951.

The product of its digits is 38880, while the sum is 34.

The square root of 33661645 is about 5801.8656482204. The cubic root of 33661645 is about 322.8829495331.

The spelling of 33661645 in words is "thirty-three million, six hundred sixty-one thousand, six hundred forty-five".