665135741 has 4 divisors (see below), whose sum is σ = 671022012. Its totient is φ = 659249472.

The previous prime is 665135729. The next prime is 665135747. The reversal of 665135741 is 147531566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 325802500 + 339333241 = 18050^2 + 18421^2 .

It is a cyclic number.

It is not a de Polignac number, because 665135741 - 2¹⁸ = 664873597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665135695 and 665135704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665135747) 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, 2942966 + ... + 2943191.

It is an arithmetic number, because the mean of its divisors is an integer number (167755503).

Almost surely, 2^665135741 is an apocalyptic number.

It is an amenable number.

665135741 is a deficient number, since it is larger than the sum of its proper divisors (5886271).

665135741 is a wasteful number, since it uses less digits than its factorization.

665135741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5886270.

The product of its digits is 75600, while the sum is 38.

The square root of 665135741 is about 25790.2256872638. The cubic root of 665135741 is about 872.9112588447.

The spelling of 665135741 in words is "six hundred sixty-five million, one hundred thirty-five thousand, seven hundred forty-one".