666015445 has 4 divisors (see below), whose sum is σ = 799218540. Its totient is φ = 532812352.

The previous prime is 666015431. The next prime is 666015451. The reversal of 666015445 is 544510666.

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 169572484 + 496442961 = 13022^2 + 22281^2 .

It is a cyclic number.

It is not a de Polignac number, because 666015445 - 2¹³ = 666007253 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, 66601540 + ... + 66601549.

It is an arithmetic number, because the mean of its divisors is an integer number (199804635).

Almost surely, 2^666015445 is an apocalyptic number.

It is an amenable number.

666015445 is a deficient number, since it is larger than the sum of its proper divisors (133203095).

666015445 is a wasteful number, since it uses less digits than its factorization.

666015445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133203094.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 666015445 is about 25807.2750401897. The cubic root of 666015445 is about 873.2959248038.

The spelling of 666015445 in words is "six hundred sixty-six million, fifteen thousand, four hundred forty-five".