665218341 has 6 divisors (see below), whose sum is σ = 960870950. Its totient is φ = 443478888.

The previous prime is 665218339. The next prime is 665218349. The reversal of 665218341 is 143812566.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 480530241 + 184688100 = 21921^2 + 13590^2 .

It is not a de Polignac number, because 665218341 - 2¹ = 665218339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665218296 and 665218305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665218349) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36956566 + ... + 36956583.

Almost surely, 2^665218341 is an apocalyptic number.

It is an amenable number.

665218341 is a deficient number, since it is larger than the sum of its proper divisors (295652609).

665218341 is a wasteful number, since it uses less digits than its factorization.

665218341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73913155 (or 73913152 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 665218341 is about 25791.8270194261. The cubic root of 665218341 is about 872.9473915622.

The spelling of 665218341 in words is "six hundred sixty-five million, two hundred eighteen thousand, three hundred forty-one".