6660025 has 6 divisors (see below), whose sum is σ = 8258462. Its totient is φ = 5328000.

The previous prime is 6660023. The next prime is 6660029. The reversal of 6660025 is 5200666.

It can be written as a sum of positive squares in 3 ways, for example, as 249001 + 6411024 = 499^2 + 2532^2 .

It is not a de Polignac number, because 6660025 - 2¹ = 6660023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 266401 = 6660025 / (6 + 6 + 6 + 0 + 0 + 2 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133176 + ... + 133225.

Almost surely, 2^6660025 is an apocalyptic number.

It is an amenable number.

6660025 is a deficient number, since it is larger than the sum of its proper divisors (1598437).

6660025 is a wasteful number, since it uses less digits than its factorization.

6660025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266411 (or 266406 counting only the distinct ones).

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

The square root of 6660025 is about 2580.7024237599. The cubic root of 6660025 is about 188.1446845331.

The spelling of 6660025 in words is "six million, six hundred sixty thousand, twenty-five".