665846045 has 4 divisors (see below), whose sum is σ = 799015260. Its totient is φ = 532676832.

The previous prime is 665845997. The next prime is 665846047. The reversal of 665846045 is 540648566.

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 174292804 + 491553241 = 13202^2 + 22171^2 .

It is a cyclic number.

It is not a de Polignac number, because 665846045 - 2¹⁰ = 665845021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665845987 and 665846005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665846047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66584600 + ... + 66584609.

It is an arithmetic number, because the mean of its divisors is an integer number (199753815).

Almost surely, 2^665846045 is an apocalyptic number.

It is an amenable number.

665846045 is a deficient number, since it is larger than the sum of its proper divisors (133169215).

665846045 is a wasteful number, since it uses less digits than its factorization.

665846045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133169214.

The product of its (nonzero) digits is 691200, while the sum is 44.

The square root of 665846045 is about 25803.9928111911. The cubic root of 665846045 is about 873.2218780355.

The spelling of 665846045 in words is "six hundred sixty-five million, eight hundred forty-six thousand, forty-five".