665090836 has 12 divisors (see below), whose sum is σ = 1195366228. Its totient is φ = 323557632.

The previous prime is 665090827. The next prime is 665090849. The reversal of 665090836 is 638090566.

665090836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 253000836 + 412090000 = 15906^2 + 20300^2 .

It is a junction number, because it is equal to n+sod(n) for n = 665090792 and 665090801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2246781 + ... + 2247076.

Almost surely, 2^665090836 is an apocalyptic number.

It is an amenable number.

665090836 is a deficient number, since it is larger than the sum of its proper divisors (530275392).

665090836 is a wasteful number, since it uses less digits than its factorization.

665090836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493898 (or 4493896 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 665090836 is about 25789.3550908122. The cubic root of 665090836 is about 872.8916142519.

The spelling of 665090836 in words is "six hundred sixty-five million, ninety thousand, eight hundred thirty-six".