665614445 has 4 divisors (see below), whose sum is σ = 798737340. Its totient is φ = 532491552.

The previous prime is 665614387. The next prime is 665614451. The reversal of 665614445 is 544416566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544416566 = 2 ⋅272208283.

It can be written as a sum of positive squares in 2 ways, for example, as 400120009 + 265494436 = 20003^2 + 16294^2 .

It is a cyclic number.

It is not a de Polignac number, because 665614445 - 2²⁴ = 648837229 is a prime.

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, 66561440 + ... + 66561449.

It is an arithmetic number, because the mean of its divisors is an integer number (199684335).

Almost surely, 2^665614445 is an apocalyptic number.

It is an amenable number.

665614445 is a deficient number, since it is larger than the sum of its proper divisors (133122895).

665614445 is a wasteful number, since it uses less digits than its factorization.

665614445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133122894.

The product of its digits is 345600, while the sum is 41.

The square root of 665614445 is about 25799.5047433085. The cubic root of 665614445 is about 873.1206225772.

The spelling of 665614445 in words is "six hundred sixty-five million, six hundred fourteen thousand, four hundred forty-five".