666433 has 2 divisors, whose sum is σ = 666434. Its totient is φ = 666432.

The previous prime is 666431. The next prime is 666437. The reversal of 666433 is 334666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559504 + 106929 = 748^2 + 327^2 .

It is a cyclic number.

It is not a de Polignac number, because 666433 - 2¹ = 666431 is a prime.

Together with 666431, it forms a pair of twin primes.

It is an Ulam number.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (666431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333216 + 333217.

It is an arithmetic number, because the mean of its divisors is an integer number (333217).

2⁶⁶⁶⁴³³ is an apocalyptic number.

It is an amenable number.

666433 is a deficient number, since it is larger than the sum of its proper divisors (1).

666433 is an equidigital number, since it uses as much as digits as its factorization.

666433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 28.

The square root of 666433 is about 816.3534773614. The cubic root of 666433 is about 87.3478389492.

It can be divided in two parts, 6664 and 33, that multiplied together give a palindrome (219912).

The spelling of 666433 in words is "six hundred sixty-six thousand, four hundred thirty-three".