665498349 has 30 divisors (see below), whose sum is σ = 1013197614. Its totient is φ = 435203280.

The previous prime is 665498311. The next prime is 665498357. The reversal of 665498349 is 943894566.

665498349 is a `hidden beast` number, since 66 + 549 + 8 + 34 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 392753124 + 272745225 = 19818^2 + 16515^2 .

It is not a de Polignac number, because 665498349 - 2²⁴ = 648721133 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665498295 and 665498304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665498749) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1813164 + ... + 1813530.

Almost surely, 2^665498349 is an apocalyptic number.

It is an amenable number.

665498349 is a deficient number, since it is larger than the sum of its proper divisors (347699265).

665498349 is an frugal number, since it uses more digits than its factorization.

665498349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 431 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 665498349 is about 25797.2546795197. The cubic root of 665498349 is about 873.0698565987.

The spelling of 665498349 in words is "six hundred sixty-five million, four hundred ninety-eight thousand, three hundred forty-nine".