660031225 has 18 divisors (see below), whose sum is σ = 952063134. Its totient is φ = 452592000.

The previous prime is 660031219. The next prime is 660031231. The reversal of 660031225 is 522130066.

It is an interprime number because it is at equal distance from previous prime (660031219) and next prime (660031231).

It can be written as a sum of positive squares in 3 ways, for example, as 414736 + 659616489 = 644^2 + 25683^2 .

It is not a de Polignac number, because 660031225 - 2³ = 660031217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660031225.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 268176 + ... + 270625.

Almost surely, 2^660031225 is an apocalyptic number.

It is an amenable number.

660031225 is a deficient number, since it is larger than the sum of its proper divisors (292031909).

660031225 is a wasteful number, since it uses less digits than its factorization.

660031225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538825 (or 538813 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 660031225 is about 25691.0728658809. The cubic root of 660031225 is about 870.6724993655.

The spelling of 660031225 in words is "six hundred sixty million, thirty-one thousand, two hundred twenty-five".