665911045 has 4 divisors (see below), whose sum is σ = 799093260. Its totient is φ = 532728832.

The previous prime is 665911039. The next prime is 665911061. The reversal of 665911045 is 540119566.

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 527942529 + 137968516 = 22977^2 + 11746^2 .

It is a cyclic number.

It is not a de Polignac number, because 665911045 - 2⁵ = 665911013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665910995 and 665911013.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 66591100 + ... + 66591109.

It is an arithmetic number, because the mean of its divisors is an integer number (199773315).

Almost surely, 2^665911045 is an apocalyptic number.

It is an amenable number.

665911045 is a deficient number, since it is larger than the sum of its proper divisors (133182215).

665911045 is a wasteful number, since it uses less digits than its factorization.

665911045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133182214.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 665911045 is about 25805.2522754574. The cubic root of 665911045 is about 873.2502917986.

The spelling of 665911045 in words is "six hundred sixty-five million, nine hundred eleven thousand, forty-five".