660326886025 has 27 divisors (see below), whose sum is σ = 822962632359. Its totient is φ = 525592914000.

The previous prime is 660326885971. The next prime is 660326886029. The reversal of 660326886025 is 520688623066.

The square root of 660326886025 is 812605.

It is a perfect power (a square), and thus also a powerful number.

660326886025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 237717678969 + 422609207056 = 487563^2 + 650084^2 .

It is a de Polignac number, because none of the positive numbers 2^k-660326886025 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660326886029) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1344861030 + ... + 1344861520.

Almost surely, 2^660326886025 is an apocalyptic number.

660326886025 is the 812605-th square number.

660326886025 is the 406303-rd centered octagonal number.

It is an amenable number.

660326886025 is a deficient number, since it is larger than the sum of its proper divisors (162635746334).

660326886025 is an frugal number, since it uses more digits than its factorization.

660326886025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 660326886025 in words is "six hundred sixty billion, three hundred twenty-six million, eight hundred eighty-six thousand, twenty-five".