666043 has 16 divisors (see below), whose sum is σ = 838080. Its totient is φ = 516096.

The previous prime is 666041. The next prime is 666067. The reversal of 666043 is 340666.

It is a happy number.

666043 is nontrivially palindromic in base 15.

It is not a de Polignac number, because 666043 - 2¹ = 666041 is a prime.

It is a super-2 number, since 2×666043² = 887226555698, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 665999 and 666017.

It is not an unprimeable number, because it can be changed into a prime (666041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3355 + ... + 3547.

It is an arithmetic number, because the mean of its divisors is an integer number (52380).

2⁶⁶⁶⁰⁴³ is an apocalyptic number.

666043 is a deficient number, since it is larger than the sum of its proper divisors (172037).

666043 is a wasteful number, since it uses less digits than its factorization.

666043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 666043 is about 816.1145752895. The cubic root of 666043 is about 87.3307968237.

It can be divided in two parts, 6 and 66043, that added together give a square (66049 = 257²).

The spelling of 666043 in words is "six hundred sixty-six thousand, forty-three".