665605733 has 4 divisors (see below), whose sum is σ = 716806188. Its totient is φ = 614405280.

The previous prime is 665605693. The next prime is 665605753. The reversal of 665605733 is 337506566.

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 64032004 + 601573729 = 8002^2 + 24527^2 .

It is a cyclic number.

It is not a de Polignac number, because 665605733 - 2¹² = 665601637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665605753) 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, 25600208 + ... + 25600233.

It is an arithmetic number, because the mean of its divisors is an integer number (179201547).

Almost surely, 2^665605733 is an apocalyptic number.

It is an amenable number.

665605733 is a deficient number, since it is larger than the sum of its proper divisors (51200455).

665605733 is a wasteful number, since it uses less digits than its factorization.

665605733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51200454.

The product of its (nonzero) digits is 340200, while the sum is 41.

The square root of 665605733 is about 25799.3359023057. The cubic root of 665605733 is about 873.1168132347.

The spelling of 665605733 in words is "six hundred sixty-five million, six hundred five thousand, seven hundred thirty-three".