665425 has 12 divisors (see below), whose sum is σ = 845680. Its totient is φ = 519120.

The previous prime is 665419. The next prime is 665429. The reversal of 665425 is 524566.

665425 = T₃₀ + T₃₁ + ... + T₁₅₈.

It is not a de Polignac number, because 665425 - 2¹³ = 657233 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 665393 and 665402.

It is not an unprimeable number, because it can be changed into a prime (665429) 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, 766 + ... + 1384.

2⁶⁶⁵⁴²⁵ is an apocalyptic number.

It is an amenable number.

665425 is a deficient number, since it is larger than the sum of its proper divisors (180255).

665425 is a wasteful number, since it uses less digits than its factorization.

665425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 667 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 665425 is about 815.7358641129. The cubic root of 665425 is about 87.3037779808.

The spelling of 665425 in words is "six hundred sixty-five thousand, four hundred twenty-five".