1666668117 has 16 divisors (see below), whose sum is σ = 2371479552. Its totient is φ = 1037514240.

The previous prime is 1666668109. The next prime is 1666668119. The reversal of 1666668117 is 7118666661.

It is not a de Polignac number, because 1666668117 - 2³ = 1666668109 is a prime.

It is a super-2 number, since 2×1666668117² = 5555565224448651378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666668119) 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, 122184 + ... + 135137.

It is an arithmetic number, because the mean of its divisors is an integer number (148217472).

Almost surely, 2^1666668117 is an apocalyptic number.

1666668117 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1666668117 is a deficient number, since it is larger than the sum of its proper divisors (704811435).

1666668117 is a wasteful number, since it uses less digits than its factorization.

1666668117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257468.

The product of its digits is 435456, while the sum is 48.

The square root of 1666668117 is about 40824.8468092656. The cubic root of 1666668117 is about 1185.6314454086.

The spelling of 1666668117 in words is "one billion, six hundred sixty-six million, six hundred sixty-eight thousand, one hundred seventeen".