1665254033 has 4 divisors (see below), whose sum is σ = 1665471780. Its totient is φ = 1665036288.

The previous prime is 1665254021. The next prime is 1665254047. The reversal of 1665254033 is 3304525661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3304525661 = 42611 ⋅77551.

It can be written as a sum of positive squares in 2 ways, for example, as 1551020689 + 114233344 = 39383^2 + 10688^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665254033 - 2⁶ = 1665253969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1665253984 and 1665254002.

It is not an unprimeable number, because it can be changed into a prime (1665254083) 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, 96968 + ... + 112841.

It is an arithmetic number, because the mean of its divisors is an integer number (416367945).

Almost surely, 2^1665254033 is an apocalyptic number.

It is an amenable number.

1665254033 is a deficient number, since it is larger than the sum of its proper divisors (217747).

1665254033 is an equidigital number, since it uses as much as digits as its factorization.

1665254033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217746.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 1665254033 is about 40807.5242204180. The cubic root of 1665254033 is about 1185.2960343314.

Adding to 1665254033 its reverse (3304525661), we get a palindrome (4969779694).

The spelling of 1665254033 in words is "one billion, six hundred sixty-five million, two hundred fifty-four thousand, thirty-three".