666634 has 16 divisors (see below), whose sum is σ = 1075680. Its totient is φ = 308880.

The previous prime is 666607. The next prime is 666637. The reversal of 666634 is 436666.

It is a junction number, because it is equal to n+sod(n) for n = 666596 and 666605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1849 + ... + 2179.

It is an arithmetic number, because the mean of its divisors is an integer number (67230).

2⁶⁶⁶⁶³⁴ is an apocalyptic number.

666634 is a deficient number, since it is larger than the sum of its proper divisors (409046).

666634 is a wasteful number, since it uses less digits than its factorization.

666634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its digits is 15552, while the sum is 31.

The square root of 666634 is about 816.4765765164. The cubic root of 666634 is about 87.3566196022.

The spelling of 666634 in words is "six hundred sixty-six thousand, six hundred thirty-four".