1666420006 has 8 divisors (see below), whose sum is σ = 2499948360. Its totient is φ = 833103888.

The previous prime is 1666420003. The next prime is 1666420037. The reversal of 1666420006 is 6000246661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1666420006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666420001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31711 + ... + 65866.

It is an arithmetic number, because the mean of its divisors is an integer number (312493545).

Almost surely, 2^1666420006 is an apocalyptic number.

1666420006 is a deficient number, since it is larger than the sum of its proper divisors (833528354).

1666420006 is an equidigital number, since it uses as much as digits as its factorization.

1666420006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106118.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1666420006 is about 40821.8079707403. The cubic root of 1666420006 is about 1185.5726088994.

Adding to 1666420006 its reverse (6000246661), we get a palindrome (7666666667).

The spelling of 1666420006 in words is "one billion, six hundred sixty-six million, four hundred twenty thousand, six".