660025 has 12 divisors (see below), whose sum is σ = 867132. Its totient is φ = 496640.

The previous prime is 660013. The next prime is 660029. The reversal of 660025 is 520066.

It can be written as a sum of positive squares in 6 ways, for example, as 32761 + 627264 = 181^2 + 792^2 .

It is not a de Polignac number, because 660025 - 2⁹ = 659513 is a prime.

It is a super-4 number, since 4×660025⁴ (a number of 24 digits) contains 4444 as substring.

It is a Duffinian number.

660025 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 659984 and 660011.

It is not an unprimeable number, because it can be changed into a prime (660029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 352 + ... + 1201.

It is an arithmetic number, because the mean of its divisors is an integer number (72261).

2⁶⁶⁰⁰²⁵ is an apocalyptic number.

It is an amenable number.

660025 is a deficient number, since it is larger than the sum of its proper divisors (207107).

660025 is a wasteful number, since it uses less digits than its factorization.

660025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1575 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 660025 is about 812.4192267543. The cubic root of 660025 is about 87.0669762145.

It can be divided in two parts, 6 and 60025, that added together give a triangular number (60031 = T₃₄₆).

The spelling of 660025 in words is "six hundred sixty thousand, twenty-five".