666622 has 16 divisors (see below), whose sum is σ = 1103472. Its totient is φ = 299520.

The previous prime is 666607. The next prime is 666637. The reversal of 666622 is 226666.

It is an interprime number because it is at equal distance from previous prime (666607) and next prime (666637).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

666622 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3358 + ... + 3550.

It is an arithmetic number, because the mean of its divisors is an integer number (68967).

2⁶⁶⁶⁶²² is an apocalyptic number.

666622 is a deficient number, since it is larger than the sum of its proper divisors (436850).

666622 is a wasteful number, since it uses less digits than its factorization.

666622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363.

The product of its digits is 5184, while the sum is 28.

The square root of 666622 is about 816.4692278341. The cubic root of 666622 is about 87.3560954337.

The spelling of 666622 in words is "six hundred sixty-six thousand, six hundred twenty-two".