33145661 has 4 divisors (see below), whose sum is σ = 33157692. Its totient is φ = 33133632.

The previous prime is 33145657. The next prime is 33145663. The reversal of 33145661 is 16654133.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18438436 + 14707225 = 4294^2 + 3835^2 .

It is a cyclic number.

It is not a de Polignac number, because 33145661 - 2² = 33145657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33145663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395 + ... + 8151.

It is an arithmetic number, because the mean of its divisors is an integer number (8289423).

Almost surely, 2^33145661 is an apocalyptic number.

It is an amenable number.

33145661 is a deficient number, since it is larger than the sum of its proper divisors (12031).

33145661 is an equidigital number, since it uses as much as digits as its factorization.

33145661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12030.

The product of its digits is 6480, while the sum is 29.

The square root of 33145661 is about 5757.2268497950. The cubic root of 33145661 is about 321.2246723106.

Adding to 33145661 its reverse (16654133), we get a palindrome (49799794).

The spelling of 33145661 in words is "thirty-three million, one hundred forty-five thousand, six hundred sixty-one".