665744033 has 4 divisors (see below), whose sum is σ = 670986240. Its totient is φ = 660501828.

The previous prime is 665743999. The next prime is 665744041. The reversal of 665744033 is 330447566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665744033 - 2⁸ = 665743777 is a prime.

It is a super-3 number, since 3×665744033³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665741033) 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, 2620913 + ... + 2621166.

It is an arithmetic number, because the mean of its divisors is an integer number (167746560).

Almost surely, 2^665744033 is an apocalyptic number.

It is an amenable number.

665744033 is a deficient number, since it is larger than the sum of its proper divisors (5242207).

665744033 is a wasteful number, since it uses less digits than its factorization.

665744033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5242206.

The product of its (nonzero) digits is 181440, while the sum is 38.

The square root of 665744033 is about 25802.0160646412. The cubic root of 665744033 is about 873.1772813101.

It can be divided in two parts, 66574 and 4033, that added together give a palindrome (70607).

The spelling of 665744033 in words is "six hundred sixty-five million, seven hundred forty-four thousand, thirty-three".