1666116255 has 8 divisors (see below), whose sum is σ = 2665786032. Its totient is φ = 888595328.

The previous prime is 1666116239. The next prime is 1666116307. The reversal of 1666116255 is 5526116661.

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 1666116255 - 2⁴ = 1666116239 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55537194 + ... + 55537223.

It is an arithmetic number, because the mean of its divisors is an integer number (333223254).

Almost surely, 2^1666116255 is an apocalyptic number.

1666116255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666116255 is a deficient number, since it is larger than the sum of its proper divisors (999669777).

1666116255 is a wasteful number, since it uses less digits than its factorization.

1666116255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111074425.

The product of its digits is 64800, while the sum is 39.

The square root of 1666116255 is about 40818.0873510751. The cubic root of 1666116255 is about 1185.5005700883.

The spelling of 1666116255 in words is "one billion, six hundred sixty-six million, one hundred sixteen thousand, two hundred fifty-five".