10000166661 has 8 divisors (see below), whose sum is σ = 14815061760. Its totient is φ = 6666777756.

The previous prime is 10000166593. The next prime is 10000166663. The reversal of 10000166661 is 16666100001.

It is not a de Polignac number, because 10000166661 - 2¹⁷ = 10000035589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 370376543 = 10000166661 / (1 + 0 + 0 + 0 + 0 + 1 + 6 + 6 + 6 + 6 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000166663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185188245 + ... + 185188298.

It is an arithmetic number, because the mean of its divisors is an integer number (1851882720).

Almost surely, 2^10000166661 is an apocalyptic number.

It is an amenable number.

10000166661 is a deficient number, since it is larger than the sum of its proper divisors (4814895099).

10000166661 is an equidigital number, since it uses as much as digits as its factorization.

10000166661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370376552 (or 370376546 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

Adding to 10000166661 its reverse (16666100001), we get a palindrome (26666266662).

The spelling of 10000166661 in words is "ten billion, one hundred sixty-six thousand, six hundred sixty-one".