666450 has 36 divisors (see below), whose sum is σ = 1791738. Its totient is φ = 177600.

The previous prime is 666439. The next prime is 666461. The reversal of 666450 is 54666.

It is an interprime number because it is at equal distance from previous prime (666439) and next prime (666461).

It can be written as a sum of positive squares in 3 ways, for example, as 471969 + 194481 = 687^2 + 441^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666450.

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, 291 + ... + 1190.

2⁶⁶⁶⁴⁵⁰ is an apocalyptic number.

666450 is an abundant number, since it is smaller than the sum of its proper divisors (1125288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666450 is a wasteful number, since it uses less digits than its factorization.

666450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499 (or 1491 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 666450 is about 816.3638894513. The cubic root of 666450 is about 87.3485816598.

The spelling of 666450 in words is "six hundred sixty-six thousand, four hundred fifty".