10001666 has 8 divisors (see below), whose sum is σ = 15183504. Its totient is φ = 4940500.

The previous prime is 10001659. The next prime is 10001687. The reversal of 10001666 is 66610001.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29960 + ... + 30291.

It is an arithmetic number, because the mean of its divisors is an integer number (1897938).

Almost surely, 2^10001666 is an apocalyptic number.

10001666 is a deficient number, since it is larger than the sum of its proper divisors (5181838).

10001666 is an equidigital number, since it uses as much as digits as its factorization.

10001666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60336.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 10001666 is about 3162.5410669270. The cubic root of 10001666 is about 215.4554326328.

Adding to 10001666 its reverse (66610001), we get a palindrome (76611667).

It can be divided in two parts, 10001 and 666, that multiplied together give a palindrome (6660666).

The spelling of 10001666 in words is "ten million, one thousand, six hundred sixty-six".