665041636 has 24 divisors (see below), whose sum is σ = 1372990976. Its totient is φ = 275823360.

The previous prime is 665041627. The next prime is 665041661. The reversal of 665041636 is 636140566.

It is a super-2 number, since 2×665041636² = 884560755227112992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665041595 and 665041604.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 382221 + ... + 383956.

Almost surely, 2^665041636 is an apocalyptic number.

It is an amenable number.

665041636 is an abundant number, since it is smaller than the sum of its proper divisors (707949340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665041636 is a wasteful number, since it uses less digits than its factorization.

665041636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766219 (or 766217 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 665041636 is about 25788.4011912332. The cubic root of 665041636 is about 872.8700897102.

The spelling of 665041636 in words is "six hundred sixty-five million, forty-one thousand, six hundred thirty-six".