666006422 has 4 divisors (see below), whose sum is σ = 999009636. Its totient is φ = 333003210.

The previous prime is 666006421. The next prime is 666006437. The reversal of 666006422 is 224600666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 224600666 = 2 ⋅112300333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666006421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166501604 + ... + 166501607.

It is an arithmetic number, because the mean of its divisors is an integer number (249752409).

Almost surely, 2^666006422 is an apocalyptic number.

666006422 is a deficient number, since it is larger than the sum of its proper divisors (333003214).

666006422 is a wasteful number, since it uses less digits than its factorization.

666006422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333003213.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 666006422 is about 25807.1002245506. The cubic root of 666006422 is about 873.2919810591.

The spelling of 666006422 in words is "six hundred sixty-six million, six thousand, four hundred twenty-two".