660725605 has 4 divisors (see below), whose sum is σ = 792870732. Its totient is φ = 528580480.

The previous prime is 660725603. The next prime is 660725609. The reversal of 660725605 is 506527066.

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 488144836 + 172580769 = 22094^2 + 13137^2 .

It is not a de Polignac number, because 660725605 - 2¹ = 660725603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660725603) 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, 66072556 + ... + 66072565.

It is an arithmetic number, because the mean of its divisors is an integer number (198217683).

Almost surely, 2^660725605 is an apocalyptic number.

It is an amenable number.

660725605 is a deficient number, since it is larger than the sum of its proper divisors (132145127).

660725605 is a wasteful number, since it uses less digits than its factorization.

660725605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132145126.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 660725605 is about 25704.5833461661. The cubic root of 660725605 is about 870.9777201175.

The spelling of 660725605 in words is "six hundred sixty million, seven hundred twenty-five thousand, six hundred five".