133330661 has 4 divisors (see below), whose sum is σ = 137928300. Its totient is φ = 128733024.

The previous prime is 133330651. The next prime is 133330663. The reversal of 133330661 is 166033331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166033331 = 3407 ⋅48733.

It can be written as a sum of positive squares in 2 ways, for example, as 38365636 + 94965025 = 6194^2 + 9745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133330661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 133330661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133330663) 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, 2298776 + ... + 2298833.

It is an arithmetic number, because the mean of its divisors is an integer number (34482075).

Almost surely, 2^133330661 is an apocalyptic number.

It is an amenable number.

133330661 is a deficient number, since it is larger than the sum of its proper divisors (4597639).

133330661 is an equidigital number, since it uses as much as digits as its factorization.

133330661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4597638.

The product of its (nonzero) digits is 2916, while the sum is 26.

The square root of 133330661 is about 11546.8896677850. The cubic root of 133330661 is about 510.8695418492.

Adding to 133330661 its reverse (166033331), we get a palindrome (299363992).

The spelling of 133330661 in words is "one hundred thirty-three million, three hundred thirty thousand, six hundred sixty-one".