1661833133 has 4 divisors (see below), whose sum is σ = 1706747580. Its totient is φ = 1616918688.

The previous prime is 1661833111. The next prime is 1661833211. The reversal of 1661833133 is 3313381661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3313381661 = 7309 ⋅453329.

It can be written as a sum of positive squares in 2 ways, for example, as 1296144004 + 365689129 = 36002^2 + 19123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1661833133 - 2⁸ = 1661832877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1661833093 and 1661833102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661833333) 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 3 ways as a sum of consecutive naturals, for example, 22457168 + ... + 22457241.

It is an arithmetic number, because the mean of its divisors is an integer number (426686895).

Almost surely, 2^1661833133 is an apocalyptic number.

It is an amenable number.

1661833133 is a deficient number, since it is larger than the sum of its proper divisors (44914447).

1661833133 is an equidigital number, since it uses as much as digits as its factorization.

1661833133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44914446.

The product of its digits is 23328, while the sum is 35.

The square root of 1661833133 is about 40765.5876076870. The cubic root of 1661833133 is about 1184.4838341407.

The spelling of 1661833133 in words is "one billion, six hundred sixty-one million, eight hundred thirty-three thousand, one hundred thirty-three".