6665543105 has 16 divisors (see below), whose sum is σ = 8661538704. Its totient is φ = 4895043840.

The previous prime is 6665543099. The next prime is 6665543153. The reversal of 6665543105 is 5013455666.

It can be written as a sum of positive squares in 8 ways, for example, as 1927561216 + 4737981889 = 43904^2 + 68833^2 .

It is not a de Polignac number, because 6665543105 - 2⁶ = 6665543041 is a prime.

It is a super-2 number, since 2×6665543105² = 88858929769226082050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271514 + ... + 295043.

It is an arithmetic number, because the mean of its divisors is an integer number (541346169).

Almost surely, 2^6665543105 is an apocalyptic number.

6665543105 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6665543105 is a deficient number, since it is larger than the sum of its proper divisors (1995995599).

6665543105 is a wasteful number, since it uses less digits than its factorization.

6665543105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566756.

The product of its (nonzero) digits is 324000, while the sum is 41.

The square root of 6665543105 is about 81642.7774209085. Note that the first 3 decimals coincide. The cubic root of 6665543105 is about 1881.9663206208.

The spelling of 6665543105 in words is "six billion, six hundred sixty-five million, five hundred forty-three thousand, one hundred five".