1666317123 has 16 divisors (see below), whose sum is σ = 2526029440. Its totient is φ = 1085042952.

The previous prime is 1666317113. The next prime is 1666317131. The reversal of 1666317123 is 3217136661.

It is not a de Polignac number, because 1666317123 - 2¹⁷ = 1666186051 is a prime.

It is a super-2 number, since 2×1666317123² = 5553225508805994258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666317113) 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 in 15 ways as a sum of consecutive naturals, for example, 716461 + ... + 718782.

It is an arithmetic number, because the mean of its divisors is an integer number (157876840).

Almost surely, 2^1666317123 is an apocalyptic number.

1666317123 is a deficient number, since it is larger than the sum of its proper divisors (859712317).

1666317123 is a wasteful number, since it uses less digits than its factorization.

1666317123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435295 (or 1435289 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 1666317123 is about 40820.5478037716. The cubic root of 1666317123 is about 1185.5482097331.

The spelling of 1666317123 in words is "one billion, six hundred sixty-six million, three hundred seventeen thousand, one hundred twenty-three".