665266004 has 12 divisors (see below), whose sum is σ = 1253770644. Its totient is φ = 307045824.

The previous prime is 665265989. The next prime is 665266013. The reversal of 665266004 is 400662566.

It can be written as a sum of positive squares in 2 ways, for example, as 172869904 + 492396100 = 13148^2 + 22190^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6396737 + ... + 6396840.

It is an arithmetic number, because the mean of its divisors is an integer number (104480887).

Almost surely, 2^665266004 is an apocalyptic number.

It is an amenable number.

665266004 is a deficient number, since it is larger than the sum of its proper divisors (588504640).

665266004 is a wasteful number, since it uses less digits than its factorization.

665266004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12793594 (or 12793592 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 665266004 is about 25792.7509971310. The cubic root of 665266004 is about 872.9682400041.

The spelling of 665266004 in words is "six hundred sixty-five million, two hundred sixty-six thousand, four".