1421166605 has 8 divisors (see below), whose sum is σ = 1764207000. Its totient is φ = 1097728576.

The previous prime is 1421166581. The next prime is 1421166611. The reversal of 1421166605 is 5066611241.

It can be written as a sum of positive squares in 4 ways, for example, as 2815684 + 1418350921 = 1678^2 + 37661^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1421166605 - 2²⁶ = 1354057741 is a prime.

It is a congruent number.

It is an unprimeable 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, 4900430 + ... + 4900719.

It is an arithmetic number, because the mean of its divisors is an integer number (220525875).

Almost surely, 2^1421166605 is an apocalyptic number.

It is an amenable number.

1421166605 is a deficient number, since it is larger than the sum of its proper divisors (343040395).

1421166605 is an equidigital number, since it uses as much as digits as its factorization.

1421166605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9801183.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1421166605 is about 37698.3634260163. The cubic root of 1421166605 is about 1124.2985863134.

Adding to 1421166605 its reverse (5066611241), we get a palindrome (6487777846).

The spelling of 1421166605 in words is "one billion, four hundred twenty-one million, one hundred sixty-six thousand, six hundred five".