660747025 has 27 divisors (see below), whose sum is σ = 843774771. Its totient is φ = 513277440.

The previous prime is 660747019. The next prime is 660747029. The reversal of 660747025 is 520747066.

The square root of 660747025 is 25705.

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

It can be written as a sum of positive squares in 13 ways, for example, as 306705169 + 354041856 = 17513^2 + 18816^2 .

It is not a de Polignac number, because 660747025 - 2⁷ = 660746897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660747029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6811777 + ... + 6811873.

Almost surely, 2^660747025 is an apocalyptic number.

660747025 is the 25705-th square number.

660747025 is the 12853-rd centered octagonal number.

It is an amenable number.

660747025 is a deficient number, since it is larger than the sum of its proper divisors (183027746).

660747025 is an frugal number, since it uses more digits than its factorization.

660747025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 37.

The cubic root of 660747025 is about 870.9871320635.

The spelling of 660747025 in words is "six hundred sixty million, seven hundred forty-seven thousand, twenty-five".