66425 has 6 divisors (see below), whose sum is σ = 82398. Its totient is φ = 53120.

The previous prime is 66413. The next prime is 66431. The reversal of 66425 is 52466.

It can be written as a sum of positive squares in 3 ways, for example, as 6889 + 59536 = 83^2 + 244^2 .

It is not a de Polignac number, because 66425 - 2⁶ = 66361 is a prime.

It is a d-powerful number, because it can be written as 6² + 6³ + 4⁸ + 2⁹ + 5³ .

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66425.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66425.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1304 + ... + 1353.

It is an arithmetic number, because the mean of its divisors is an integer number (13733).

2⁶⁶⁴²⁵ is an apocalyptic number.

It is an amenable number.

66425 is a deficient number, since it is larger than the sum of its proper divisors (15973).

66425 is a wasteful number, since it uses less digits than its factorization.

66425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2667 (or 2662 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 66425 is about 257.7304793772. The cubic root of 66425 is about 40.4989584653.

The spelling of 66425 in words is "sixty-six thousand, four hundred twenty-five".