666345325 has 36 divisors (see below), whose sum is σ = 877748508. Its totient is φ = 501491200.

The previous prime is 666345319. The next prime is 666345359. The reversal of 666345325 is 523543666.

It can be written as a sum of positive squares in 18 ways, for example, as 656691876 + 9653449 = 25626^2 + 3107^2 .

It is not a de Polignac number, because 666345325 - 2¹¹ = 666343277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 861639 + ... + 862411.

It is an arithmetic number, because the mean of its divisors is an integer number (24381903).

Almost surely, 2^666345325 is an apocalyptic number.

It is an amenable number.

666345325 is a deficient number, since it is larger than the sum of its proper divisors (211403183).

666345325 is a wasteful number, since it uses less digits than its factorization.

666345325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882 (or 848 counting only the distinct ones).

The product of its digits is 388800, while the sum is 40.

The square root of 666345325 is about 25813.6654700567. The cubic root of 666345325 is about 873.4400832774.

The spelling of 666345325 in words is "six hundred sixty-six million, three hundred forty-five thousand, three hundred twenty-five".