666425 has 24 divisors (see below), whose sum is σ = 922560. Its totient is φ = 475200.

The previous prime is 666403. The next prime is 666427. The reversal of 666425 is 524666.

666425 = T₄₆ + T₄₇ + ... + T₁₅₉.

666425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666425 - 2¹⁶ = 600889 is a prime.

Its product of digits (8640) is a multiple of the sum of its prime divisors (108).

It is not an unprimeable number, because it can be changed into a prime (666427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10895 + ... + 10955.

It is an arithmetic number, because the mean of its divisors is an integer number (38440).

2⁶⁶⁶⁴²⁵ is an apocalyptic number.

It is an amenable number.

666425 is a deficient number, since it is larger than the sum of its proper divisors (256135).

666425 is a wasteful number, since it uses less digits than its factorization.

666425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 108 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 666425 is about 816.3485775084. The cubic root of 666425 is about 87.3474894339.

The spelling of 666425 in words is "six hundred sixty-six thousand, four hundred twenty-five".